These Rainbow Chip Brownies are made using the best homemade buttermilk brownie recipe! Move over Cosmic Brownies from Little Debbie...these are too delicious to compare!
Prep Time5 minutesmins
Cook Time20 minutesmins
Additional Time2 hourshrs
Total Time2 hourshrs25 minutesmins
Course: Brownies and Bars
Cuisine: American
Keyword: cosmic brownies, frosted brownies with sprinkles
Preheat oven to 400F. Line a 13x9-inch baking dish with parchment paper. Set aside.
For the brownies, in a small saucepan over medium high heat, combine butter, cocoa powder and oil. Bring to a boil and remove from heat.
In a large mixing bowl, combine granulated sugar, eggs, buttermilk and vanilla. Slowly whisk in the butter mixture. Add in flour, baking soda, and salt. Stir just until combined. Fold in chocolate chips.
Pour into prepared baking dish and bake for 20 minutes. Remove from oven and cool.
While cooling, prepare the frosting. Combine butter, buttermilk and cocoa powder in a small saucepan. Whisk over medium heat until mixture begins to boil. Remove from heat.
In a mixing bowl, combine powdered sugar with butter mixture. Beat for several minutes until smooth. Pour over brownies. Sprinkle immediately with rainbow chips!
Refrigerate for about 2 hours, until set. Cut and enjoy. I store these in the refrigerator for best results!
Notes
Chill the brownies before cutting. These taste extra delicious served cold straight out of the fridge!
Bake in a 13 x 9 baking dish. You’ll have plenty of thick, moist brownies to go around.
How to store brownies: Stored in the fridge, rainbow chip brownies stay good for about 1 week. For longer storage, you can freeze them.