1: Preheat oven to 350°F (180°C).
2: In a bowl, mash the bananas with a fork.
3: Add nut butter and mix until combined.
4: Divide the batter into two bowls.
5: Add cocoa powder to one bowl of batter and mix well.
6: Add the blueberries to the other bowl of batter and mix well.
7: Add the batter to a muffin tin.
8: Bake for 18-20 minutes.
9: Let muffins cool.
10: Enjoy!
