01 -
Preheat the oven to 425°F. Line a 12-cup muffin pan with paper liners or grease generously with nonstick spray.
02 -
In a large bowl, whisk together flour, dark brown sugar, granulated sugar, baking powder, baking soda, and salt until evenly incorporated.
03 -
Stir in the semisweet chocolate chips to the dry mixture and set aside.
04 -
In a separate bowl, whisk mashed bananas, oil, eggs, vanilla extract, and Greek yogurt until smooth and homogeneous.
05 -
Gently fold the wet ingredients into the dry ingredients using a spatula or large spoon until just combined. The batter should be thick and slightly lumpy; avoid overmixing.
06 -
Cover and refrigerate the batter for 30 minutes or overnight to improve texture and muffin rise (optional).
07 -
Divide the batter evenly, filling each muffin cup to the top, ensuring 12 muffins total.
08 -
Bake at 425°F for 10 minutes. Without opening the oven door, reduce temperature to 350°F and bake for an additional 10–15 minutes until muffins are golden and a toothpick inserted comes out clean.
09 -
Immediately after baking, sprinkle extra chocolate chips on top. Let muffins cool in the pan for 5 minutes before transferring to a wire rack.