1/2cupsour cream (or full fat, plain Greek yogurt), at room temperature
1Tbspvanilla
1/2cupbrown sugar
1/2cupgranulated sugar, plus more for sprinkling
2cupsall purpose flour
1Tbspbaking powder
1/2tspkosher salt
1cupchocolate chips, plus more for sprinkling
1/4cupgrated chocolate for sprinkling (optional)
Instructions
Move an oven rack to the top 1/3 of the oven. Preheat the oven to 425F. Line 18 muffin cups with liners, and lightly spray the insides of the liners with cooking spray.
In a large mixing bowl, mash the bananas until smooth. Whisk in the melted butter, eggs, sour cream and vanilla. In a separate bowl, combine the brown sugar, 1/2 cup of white sugar, flour, baking powder and salt. Add the dry ingredients to the wet ingredients and stir with silicone spatula or wooden spoon until just combined. Stir in 1 cup of chocolate chips.
Portion the batter evenly into the prepared muffin cups, filling each about 3/4 full. Sprinkle the top of each muffin with granulated sugar, using about 1/4 tsp of sugar for each muffin. Sprinkle the top of each muffin with chocolate chips, then with grated chocolate, if using.
Bake the muffins for 8 minutes. Without opening the door, reduce the heat to 350F and bake muffins another 7-8 minutes until lightly golden and a toothpick inserted in the centre of the muffins comes out clean. Allow muffins to cool in the muffin pan for 5 minutes, then transfer to a wire rack to cool completely.