Preheat your oven to 375°F
Add all of the ingredients to a blender except the frozen berries. Blend until smooth.
Spray a muffin tin with cooking spray and pour the batter into the wells. It will make around 9 or 10 muffins depending on the size of your bananas.
Top each muffin with the frozen berries.
Bake for 18-20 minutes or until a toothpick inserted into the center of a muffin comes out clean.
