Love and Olive Oil
Ganache-Stuffed Cosmic Brownie Cookies

Ganache-Stuffed Cosmic Brownie Cookies

Don’t be fooled by their cheerful exterior, because these chocolate brownie cookies have a dark secret: a hidden core of rich and creamy chocolate ganache.

Cosmic brownies: cookie-fied! Your favorite nostalgic childhood treat is now in cookie form, with the traditional milk chocolate ganache topping stuffed inside a chewy brownie cookie.

Cooling rack with Ganache-Stuffed Cosmic Brownie Cookies, one cut in half to show filling, and a small glass milk bottle

Another day, another stuffed cookie recipe, and these ganache-stuffed brownie cookies (aka “Cosmic” brownie cookies) are fan-freaking-tastic.

I mean, the brownie cookie alone would be worth sharing, with its perfectly crinkly exterior and rich, chocolatey flavor. But with the hidden ganache filling? Well, these cookies take the cake.

The cheerful sprinkles on top only add to the appeal (it’s the truth that rainbow sprinkles make everything better).

Single chocolate brownie cookie on a gray background with brightly colored rainbow and metallic sprinkles

I originally set out to recreate my Out of This World Brownies, aka knock-off Cosmic Brownies, in cookie form.

I debated between a stuffed cookie or a sandwich cookie, but you all know how much I love my stuffed cookies, so I really didn’t debate long (and really, if you think about it, a stuffed cookie is just a one-piece-sandwich-cookie so… it’s a win win all around).

And folks… this recipe really is a winner. I’m beyond thrilled with how these came out and strongly (strongly) encourage you to make them ASAP.

Stack of Cosmic Brownie Cookies, one cookie cut in half to show ganache filling; milk bottle and more cookies blurred in the background.

The ganache filling is identical to my Ganache-Stuffed Chocolate Chip cookies, stuffed inside a crinkly, brownie-like chocolate cookie instead of a traditional chocolate chip.

I also ended up doing a mix of milk and dark chocolates here, to be more true to the original cosmic brownie flavor (and I also wanted to be able to see a bit of contrast between the dark cocoa cookie and the slightly lighter brown filling). I found that using entirely milk chocolate makes the filling a bit too soft, however, which is why I ultimately used a mix. You could use all dark chocolate (I recommend 50-60%) here if you prefer.

Assorted Sprinkle-topped Brownie Cookies scattered on a piece of crumpled parchment

As a side bonus… the ganache cores keep the cookies soft and succulent for days (not that they’ll last that long, but it’s the thought that counts). Makes sense since while a cookie can certainly dry out, ganache can’t. This fact would make these cookies a great option for shipping in care packages!

While I feel the ganache filling takes these cookies from darn good to downright incredible, the brownie cookie base is a solid recipe on its own. Unstuffed, they’ll flatten out a bit more when baking, and, without the filling to keep them soft, are really best enjoyed within a few days of baking (so maybe freeze some of the balls so you can have fresh-baked cookies on demand).

Scattered brownie cookies, one cookie cut in half to show the ganache filling.

Make the ganache about an hour ahead of time, since it will need to cool for 20 to 30 minutes until it’s pipe-able, approximately the consistency of peanut butter.

Dollop or pipe rounds of ganache onto a parchment-lined baking sheet (think the size/shape of macarons, if you’ve ever made those before – you want more of a flat round of chocolate, not a tall ‘kiss’). I think a piping bag is way easier for this step, but you can spoon it out too (about 1/2 tablespoon per dollop).

Pop the centers into the freezer until they are good and solid, another 30 minutes or so (you must have a firm filling to be able to shape the dough around it). You can also do this part a day of time, they’ll keep just fine in the freezer overnight. For longer than a day, I’d suggest transferring them to an airtight bag once they’re frozen to avoid freezer burn.

Piping dollops of ganache onto parchment for the cookie centers Stuffing the discs of frozen ganache in the middle of the cookie dough Shaping the cookie dough around the ganache filling

My technique for stuffing cookies involves two pieces of flatted dough that are then shaped around the frozen filling.

Here I used a small #70 cookie scoop, two balls per cookie.

This dough is a bit sticky (I chill it for about 20-30 minutes or until it’s just workable). If you need to, dab a little flour on your palm, then flatten the two dough balls. Place a dollop of frozen ganache on one piece of dough, top it with the other piece, then seal the edges and shape it into a nice ‘puck-like’ ball.

Dipping the tops of shaped cookie dough balls in colorful rainbow sprinkles

Pour your sprinkles into a small bowl and then dip the tops of your shaped dough balls into the sprinkles. The sprinkles will spread out more as the cookies bake, so I gave them a pretty packed in layer of sprinkles (press them in a bit more if necessary so they don’t roll all over the place).

Split screen Cosmic Brownie Cookies Before and After baking.

These cookies really benefit from the cookie cutter trick: swirling a large round cookie cutter around the cookies as soon as they come out of the oven, while they are still warm and soft (I posted a quick clip to my Instagram stories if you want to see what I mean here. It’s a bit hard to explain in just words alone).

Doing this results in perfectly round cookies with a gorgeous rumple around the edge. If you want picture-perfect cookies, this will be your new favorite trick.

Overhead, brownie cookies on parchment paper with different varieties of sprinkles

You can really use any sprinkles you want here, from the traditional Cosmic brownie rainbow bit chips to any fun sprinkle mix you might have on hand. As long as the sprinkles themselves hold up fairly well to baking, you’re good as gold.

After baking up a bunch of different variations using just about every sprinkle type in my pantry (my legendary indecisiveness strikes again) I ultimately went with a retro bit chip mix (a discontinued Sweetapolita medley called Lite Brite), which gives a nod to the original cosmic rainbow chips but with a bit more sparkly retro flair. But really, you can’t go wrong with any of the options.

Stack of Ganache-Stuffed Cosmic Brownie Cookies on a gray background, one cookie cut in half to show the filling

These cookies freeze beautifully, just freeze the stuffed and shaped cookies on a baking sheet until frozen solid, then transfer to an airtight container (a container may be a better option for these since so they don’t jostle each other and knock off all the sprinkles). You can bake them straight from frozen, just add 1-2 minutes to the specified baking time.

Ganache-Stuffed Cosmic Brownie Cookies

Ganache-Stuffed Brownie Cookies

Rich and chewy brownie cookies stuffed with a creamy chocolate ganache and topped with colorful sprinkles.


For Ganache:

  • 3.5oz (100g) good quality chocolate (I used a mix of 35% milk and 57% semisweet chocolate), finely chopped
  • 1/4 cup (60g) heavy cream

For Cookies:

  • 2 cups (250g) all-purpose flour
  • 6 tablespoons (40g) Dutch-process cocoa powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon kosher salt
  • 4oz (110g) good quality semisweet chocolate (50-60%)
  • ¾ cup (1½ sticks/170g) unsalted butter, at room temperature
  • 1 cup (220g) packed brown sugar
  • ½ cup (100g) granulated sugar
  • 2 large eggs, at room temperature
  • 2 teaspoons vanilla extract
  • rainbow bit chips or other sprinkles, as desired


  1. To make ganache, place chopped chocolate in a heat proof bowl. Line a small baking sheet or flat plate with parchment paper.
  2. Warm cream in a small saucepan until it just begins to bubble around the edges (do not let it boil). Pour over chopped chocolate. Let sit for 30 seconds then slowly whisk, working from the center outward in concentric circles until an emulsion forms. Continue to gently whisk until cream is fully incorporated and chocolate is melted. Let cool, scraping the sides and folding a few times to ensure the ganache cools evenly, for about 20-30 minutes or until ganache is thickened to the consistency of peanut butter.
  3. You can either scoop teaspoonfuls of ganache onto parchment-lined baking sheet, or, for more precise centers, transfer ganache to a piping bag fitted with a 1/2-inch round tip and pipe approximately 1¼-inch rounds of ganache onto baking sheet (pipe them like you would macaron batter, you want flat-ish shaped rounds rather than tall kisses, if that makes sense!) You should end up with about 2 dozen centers. Freeze until completely set, at least 30 minutes.
  4. To make cookie dough, whisk together flour, cocoa powder, baking soda, and salt in a bowl and set aside.
  5. Gently melt chocolate in a double boiler or microwave (use 50% power in 20 second increments) until just melted. Set aside to cool slightly.
  6. Place butter and sugars in the bowl of a stand mixer fitted with the paddle attachment. Beat on medium-high speed until lightened and somewhat fluffy, about 2 to 3 minutes.
  7. Reduce mixer speed to low and add eggs, one at a time, mixing until each egg is completely incorporated before adding the next. Scrape down the beater and the sides of the bowl, then increase speed to medium high for 30 seconds until slightly lightened in color.. Mix in vanilla.
  8. Pour in lukewarm cooled chocolate and mix on low speed, scraping the sides and bottom of the bowl well, until batter is uniform in color. Add dry ingredients and mix on low speed until just incorporated.
  9. Press a layer of plastic wrap on the surface of the dough. Refrigerate for 20 to 30 minutes or until it’s just firmed up enough to work with (I find that chilling the dough longer makes it harder to scoop, and doesn’t produce as nice looking cookies).
  10. Meanwhile, preheat oven to 350 degrees F. Line two baking sheets with parchment paper.
  11. Use a small cookie scoop to divide dough into balls, two small balls will combine to make one cookie (you can also use a medium cookie scoop and split each ball in half). Flatten dough balls into a pancake shape (if you find the dough sticky you can lightly dab your palm with a bit of flour first).
  12. Place one frozen ganache dollop in the center of one flattened piece, then top with a second. Seal the edges around the ganache, then roll slightly into a flattened ball/puck shape.
  13. Pour sprinkles into a small bowl. Press the tops of dough pucks into the sprinkles, then invert and place on prepared baking sheet, leaving 3-4 inches of space between cookies (I only fit 6 cookies on one sheet, they spread quite a bit).
  14. Repeat with remaining dough, returning ganache pieces to the freezer in the interim (if they get too soft they’ll be hard to work with). At this point the stuffed and sprinkle-topped dough balls can also be frozen if you want to save them to bake later.
  15. Bake for 9 to 11 minutes or until tops are puffed and no longer shiny.
  16. Remove from oven and immediately swirl a large round cookie cutter (larger than the diameter of the cookie) around each still-soft cookie. This will tuck in the edges and make your cookies perfectly round. Let cool on sheets for 10 minutes, then transfer to a wire rack to cool completely.
  17. Cookies will keep in an airtight container for up to one week.
All images and text © / Love & Olive Oil

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  1. Rating: 5

    These cookies are well worth the extra time and effort. I didn’t use the same kind of sprinkles, but they were still beautiful and delicious!

  2. The recipe was so good! My only comment on using large eye catching sprinkles was that their flavor interfered a bit with the lovely intense chocolate flavor. Just a caveat for fellow bakers.

  3. Are you saying put the sprinkles on pre-baking but flip them upside down so they don’t melt burn so sprinkle side down?

  4. I looooove this recipe. I made it vegan (used vegan butter & eggs) but followed all the instructions as given otherwise. Was SO good and fun, thanks for sharing :)

  5. What brand of chocolate is used in the ganache?  What chocolate is 35% milk and 57% semisweet?  

    • I used two different kinds of chocolate, one milk and one semisweet. I personally love the Trader Joe’s big bars, they’re great quality for the price!

  6. If cosmos was pink, this would be the cosmic cookie! They turned out epic (aaaaa!!! Angels sing). Hehe!

  7. Cannot recommend these enough! I’ve made them roughly 6 times since the summer! They were such a hit with my friends and family! Everyone has been requesting them for the holidays.  So good, so easy and awesome to prep ahead of time. 

  8. These were so so tasty! Took a little long to make, but so well worth it. Very chocolatey and exactly what I needed! 

  9. Can i use nafural unsweetened cocoa  powder instead processed in cocoa powder?

    • I have not tested this so I cannot say. Natural cocoa is more acidic than dutched so it may affect the rise as well as the color/flavor.

  10. DELICIOUS!! Super simple, quick and makes your home smell like a bakery. These cookies will be made again and again.

  11. Any replacement for cocoa powder? Totally forgot!

  12. Can you just use the dough for regular cookies?

    • You can make this recipe without the ganache filling, yes! They flatten out a bit more but are quite delicious!

  13. We tried these this weekend. They were delicious.

  14. Any replacement for egg?

  15. Oh wow! These look delicious. I can’t wait to make them.

  16. I love these as cookies, even thought I don’t like chocolate on chocolate brownies, maybe because of the texture or density of them, but cookies to me can never be too dense and I like just about every cookie texture and love that these have sprinkles to break up the chocolate domination, so thank you!

  17. These look great and I want to make them! There’s a typo in your recipe. Can I assume that you used 1 tsp of baking soda?

  18. When I saw these I totally remembered your cosmic brownies! Equally as stunning and wow, would love to sink my teeth into one of these with my coffee right now!

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