- 1 cup buttermilk
- 2 ripe bananas, mashed
- 2 eggs, lightly beaten
- 1/3 cup coconut oil, melted
- 1 (18 ounce) package brownie mix
- 1 cup quick-cooking oats
- 1/2 cup all-purpose flour
- 2 teaspoons unsweetened cocoa powder
- 1 1/2 teaspoons baking powder
- 1 teaspoon ground cinnamon
- Preheat oven to 350 degrees F (175 degrees C). Line a muffin tin with liners.
- Whisk buttermilk, bananas, and eggs together in a bowl; gradually stir in coconut oil.
- Combine brownie mix, oats, all-purpose flour, cocoa powder, baking powder, and cinnamon in a large bowl. Make a well in the center and pour in buttermilk mixture. Stir together until batter is just moistened.
- Divide batter among muffin liners, filling each 2/3 full.
- Bake in the preheated oven until a toothpick inserted into the center comes out clean, 25 to 30 minutes. Cool in the pan, 10 to 15 minutes. Move to a rack to cool completely, about 20 minutes.