Preheat the oven to 350℉/170℃ and line a muffin tin with liners and set aside.
Stir together flour, baking powder, baking soda, cinnamon, and salt together. Set aside.
2 cups all-purpose flour, 1 1/2 tsp baking powder, 1 tsp baking soda, 1/2 tsp cinnamon, 1/4 tsp salt
In another large bowl, add the brown sugar, white sugar, mashed bananas, eggs, oil, vanilla, and sour cream. Whisk until well combined.
1/3 cup brown sugar, 1/3 cup white sugar, 1 1/2 cups bananas, 1/2 cup oil, 2 large eggs, 1/3 cup sour cream, 1 tbsp vanilla
Combine the dry and wet ingredients together until almost combined, then mix in mini chocolate chips and stir just until no flour streaks appear. Do not over-mix!
3/4 cups mini chocolate chips
Fill the liners to the top with muffin batter and sprinkle mini chocolate chips on top.
Bake for 20-25 minutes or until a toothpick inserted comes out clean. Allow to cool, and enjoy!