Preheat oven to 375F. Line two muffins tins with paper liners.
In a bowl with hand mixer, beat the butter and both sugars together until light and fluffy.
Beat in eggs, vanilla and sour cream until combined.
In a large bowl, combine flour, baking powder, baking soda and salt and stir with a spatula.
Slowly add the dry ingredients to the wet, mixing on low until just combined.
Stir in mashed banana, 1 cup of chocolate chips and 3/4 cup coconut flakes.
Pour batter in muffins tins until 3/4 full. Sprinkle with remaining chocolate chips and coconut flakes on top.
Bake in preheated oven for 18-20 minutes or until a toothpick inserted in the middle comes out clean.