Preheat oven to 180C/350F.
Line muffin tin with parchment paper liners.
In medium bowl, combine dry ingredients and set aside.
In large bowl, smash bananas, then add rest of wet ingredients except for berries and combine.
Mix dry ingredients into wet, then fold in the berries.
Spoon into muffin tin; top with additional berries if desired.
Bake for approximately 20 minutes until muffin tops spring back when touched.
Cool on a baking rack (maybe sample one while still warm - delicious!)
Store in fridge in air-tight container.