In a large bowl, whisk together the mashed bananas, melted butter, eggs, vanilla, and sour cream until smooth.
1 cups mashed overripe bananas, ½ cup unsalted butter, 2 large eggs, 2 teaspoon pure vanilla extract, ½ cup sour cream
In a separate bowl, whisk together the flour, brown sugar, granulated sugar, baking soda, baking powder, salt, and optional cinnamon.
1/3 cup granulated sugar, 1/4 cup brown sugar, 1 ¾ cups all-purpose flour, 1/2 teaspoon baking soda, 2 & ½ teaspoon baking powder, ½ teaspoon salt, ½ tsp cinnamon for a warm banana bread flavor
Add dry ingredients to the wet and gently fold with a spatula until just combined, don’t overmix! Fold in chocolate chips.
1 cup mini or regular semi-sweet chocolate chips
Allow your batter to reast while you preheat your oven to 425°F. Line a muffin pan with paper liners in evey other hole to allow for maximum rise. Spray the tops of the pan lightly with cooking spray (for muffin top expansion).
Divide the batter between 10–12 muffin cups, filling each one to the top for tall domes. Sprinkle a few extra chocolate chips on top of each.
Start at 425°F for 5 minutes. Without opening the oven, reduce temp to 350°F and bake for 14-16 more minutes, or until a toothpick comes out clean with just a few crumbs.
Let muffins cool in the pan for 5–10 minutes, then transfer to a wire rack. Serve warm or at room temp.