Cosmic brownie cookies are soft, rich and intensely chocolatey with a fudgy, brownie-like center that practically melts in your mouth. Made without chocolate chips, these cookies let the dense, fudgy texture shine. The dough is cocoa-powder based and requires no chilling, so they come together quickly. Once baked, each cookie is finished with a silky ganache and a scatter of colorful candy for that unmistakable cosmic appearance.
Disclosure | This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases.
If you grew up loving the iconic Little Debbie cosmic brownies, you’ll adore this homemade cookie version. This easy recipe recreates the chewy fudge brownie interior, silky chocolate ganache and playful rainbow candy topping — all in a cookie that carries plenty of nostalgic charm.
After decades of cookie baking, I kept this recipe intentionally simple: no chill time and no melted chocolate in the dough. It uses melted butter and cocoa powder for a fast, fudgy result. If you enjoy brownie-style cookies, these are a quick way to get the same rich texture without extra steps.
Perfect for holiday baking, classroom treats or an indulgent weekend project, these cosmic brownie cookies bake into large, irresistibly fudgy cookies. They’re not oversized like some bakery-style cookies, but they deliver a concentrated brownie experience in each bite.
[feast_advanced_jump_to]
🛒 ingredients notes for the best cookies
This recipe is designed to be quick and reliable. I adapted a cocoa powder–based brownie approach so you don’t need melted chocolate in the dough. A few ingredient details make a big difference:
Cocoa powder — Use the best unsweetened cocoa powder you can. A higher-quality cocoa gives deeper chocolate flavor and richer color.
Coconut oil — A small amount of coconut oil helps mimic the texture of store-bought cosmic brownies, contributing to a tender, chewy interior without leaving a coconut taste.
Rainbow candy pieces — The colorful topping defines the cosmic look. Mini M&M’s, candy-coated chips or small confetti sprinkles all work; choose what’s easiest to source.
You can make a classic ganache from chopped chocolate and cream, or use a cocoa-powder based ganache if you prefer to avoid additional chocolate. See the recipe card below for options and full measurements.
Please scroll to the printable recipe card at the end of this post for the full ingredient list and step-by-step directions.
These ingredient choices help deliver deep chocolate flavor, a fudgy texture and the signature colorful finish that makes cosmic brownies so beloved.
🥣 how to make in photos
Preheat your oven to 350°F and line two baking sheets with parchment paper.
Melt the unsalted butter and coconut oil together and let the mix rest for about 5 minutes. Add kosher salt, granulated sugar and dark brown sugar, then whisk. The mixture may not look fully combined at first.
Add the egg and vanilla, whisking until the mixture comes together. The egg helps bind the sugars and fats into a cohesive base.
Whisk in baking powder and unsweetened cocoa powder until fully integrated, then finish by folding in the flour with a spatula.
Portion the dough using a cookie scoop and place scoops on the prepared baking sheets, about 2 inches apart. Use a clean hand to gently press each ball down to roughly ¼ inch thickness.
Bake for 9–10 minutes. The edges should be set while the centers remain slightly glossy — this ensures the fudgiest texture.
For round, uniform cookies, perform a quick “cookie scoot” while cookies are still hot: nudge them into shape with a round cutter, glass or bowl. Let cool on the sheet for 5 minutes, then transfer to a wire rack to finish cooling.
Tip: Avoid overbaking — the cookies will firm up as they cool and keeping them slightly underbaked yields the best fudgy interior.
👩🏻🍳 tips for the best fudgy cookies
Weigh ingredients when possible for the most consistent results. Do not grease baking sheets; parchment paper or silicone baking mats prevent excess spreading. Remove cookies from the oven when edges are set but centers still look a touch glossy.
Use a biscuit cutter, glass or bowl to gently “scoot” and shape cookies while they are still hot for thicker, perfectly round cookies.
🫙 how to store
Store in an airtight container at room temperature for up to two days, or refrigerate for up to five days. Cookies freeze well for up to two months; thaw at room temperature for 20–30 minutes before serving. Freezing is a great way to preserve the fresh, fudgy texture.
If you make these Fudgy Cosmic Brownie Cookies, snap a picture and tag me on Instagram — it’s always a joy to see your creations. Happy baking!
📖 recipe
Fudgy Cosmic Brownie Cookies
recipe created and tested by:
Tasia Harper
For best accuracy, use weight (metric) measurements when available.
Please note
When scaling the recipe, be aware that gram measurements may need to be adjusted manually.
Ingredients
brownie cookies
- ½ cup unsalted butter melted (113g)
- 2 tablespoons coconut oil melted (30g)
- ½ teaspoon kosher salt
- ½ cup granulated sugar (100g)
- ½ cup dark brown sugar* (100g)
- 1 large egg
- 2 teaspoons pure vanilla extract
- ½ teaspoon baking powder
- ½ cup unsweetened cocoa powder (40g)
- 1 ⅓ cups all-purpose flour (167g)
chocolate ganache topping***
- 4 ounces semi-sweet or dark chocolate, chopped small (113g)
- 2 ounces whipping cream (30g)
- ¼ cup rainbow candy coated pieces**
Instructions
For the brownie cookies
-
Preheat the oven to 350°F and line two baking sheets with parchment paper.
-
Melt unsalted butter (½ cup/113g) and coconut oil (2 tablespoons/30g). Let the mixture sit for 5 minutes.
-
Add kosher salt (½ teaspoon), granulated sugar (½ cup/100g) and dark brown sugar (½ cup/100g). Whisk to combine; it may not fully come together yet.
-
Add one large egg and 2 teaspoons pure vanilla extract; whisk until combined.
-
Whisk in baking powder (½ teaspoon) and unsweetened cocoa powder (½ cup/40g) until smooth.
-
Fold in all-purpose flour (1 ⅓ cups/167g) with a spatula until just combined.
-
Use a cookie scoop (about 2 tablespoons) to portion dough onto the prepared pans, spacing about 2 inches apart. Lightly flatten each scoop to about ¼ inch thickness.
-
Bake 9–10 minutes. Edges should be set while tops remain slightly shiny. Do not overbake — underbaking yields the fudgiest cookies.
-
Let cookies cool on the sheet for 5 minutes, then transfer to a wire rack to cool completely, about 20 minutes.
For the chocolate ganache topping
-
Melt 4 ounces (113g) chopped semi-sweet or dark chocolate with 2 ounces (30g) whipping cream, stirring until smooth and glossy. A double boiler works well.
-
Spoon about ¾ tablespoon of ganache onto each cooled cookie and top with rainbow candy pieces.
-
Refrigerate the decorated cookies briefly to help the ganache set and to encourage a fudgy texture.
Notes
**Rainbow candy pieces are often labeled as cosmic sprinkles, rainbow candy chips or mini candy-coated chocolates. I used a mix of mini M&M’s and small confetti quins; sprinkles also work.
Cosmic brownie cookies can be stored at room temperature in an airtight container for up to two days, refrigerated for up to five days, or frozen for up to two months.
***To make a ganache without chocolate: sift together ½ cup (60g) confectioners’ sugar and ¼ cup (20g) cocoa powder. Heat 2 ½ tablespoons (35g) butter and ⅓ cup (75mL) heavy cream in a saucepan over medium heat, whisk in the sugar/cocoa mixture and simmer briefly until combined and slightly thickened. Remove from heat and cool until spreadable.
Nutrition
Nutrition information is an estimate and may vary based on ingredients and portion sizes.