Preheat the oven to 425℉. Line 2 muffin liners with 14 liners total and set aside. Mash bananas in a large bowl and set aside.
1 1/4 cups bananas 3 medium
In a medium-sized bowl, add in flour, sifted cocoa powder, oats, salt, cornstarch, baking powder, and baking soda. Using a spatula, mix until just completely combined.
1 1/4 cups all-purpose flour, 1/4 cup unsweetened cocoa powder, 1 1/2 tsps baking powder, 1 tsp baking soda, 1 1/4 cups rolled oats, 1 tsp cornstarch, 1/4 tsp salt
In a large bowl, whisk mashed bananas, oil, eggs, vanilla, sour cream, and brown sugar. Whisk until well combined. There may be lumps from the bananas but that is okay.
3/4 cups dark brown sugar, 1 tbsp vanilla, 1/2 cup oil, 2 large eggs, 2/3 cups full-fat sour cream, 1 1/4 cups bananas 3 medium
Add the dry into the wet and using a spatula, gently fold until a soft batter forms. Do not over-mix!
Add in the chocolate chips and mix in a few times. Don't over-mix!
3/4 cups semi-sweet chocolate chips
Evenly divide the batter between 14 liners, they should be almost or all the way full. Using a cookie scooper helps big time to minimize the mess. Sprinkle some extra chocolate chips on top.
Bake the muffins at 425℉ for 5 minutes, then reduce the temperature to 375°F and continue baking for 15-20 minutes. The muffins are ready when a toothpick inserted comes out dry with no wet batter.