In a large mixing bowl, whisk together the butter and sugars with an electric hand mixer on medium-high speed until homogenous.
Add the eggs and vanilla to the creamed butter mixture. Mix again until the eggs are fully incorporated with the creamed butter.
Slowly add the cocoa powder, baking powder, and flour on a low-medium speed until the dry ingredients are fully incorporated into the wet ingredients. Scrape along the bottom of your mixing bowl with a spatula to ensure no pockets of flour or cocoa powder remain.
Preheat your oven to 350 degrees Fahrenheit and bake the cookies 6 at a time for 11 minutes. The cookies should be about 2 inches in diameter.
Melt the chocolate and heavy cream in the microwave on 30 second intervals, stirring after each interval.
Allow the cookies to cool for 10 minutes before removing them from the baking sheet. Dip the top of each cookie into the chocolate mixture and top with a few M&M’s.
Repeat the process with the remaining cookie dough.
Serve and enjoy!
Notes
Storage:
To Store: These cookies are best stored in an airtight container on the counter. They will stay fresh for about 5 days at room temperature.
To Freeze: Freeze these cosmic brownie cookies for up to 3 months in a freezer-safe container. When you’re ready to eat them, thaw them overnight in the refrigerator.
Tips:
In addition to mini M&M’s, you can use candy coated chocolate chips. These can be found at craft stores like Hobby Lobby but will be more expensive.
Make sure your butter is room temperature so that it creams well with the sugars.
You can line your pan with parchment paper or foil for easy cleanup.