Preheat the oven to 375°F. Line a standard 12-count muffin pan with liners.
In a medium bowl whisk the flour, baking soda, cinnamon, and salt.
1½ cups all purpose flour, 1 tsp baking soda, ½ tsp cinnamon, ½ tsp salt
In a large bowl, whisk the mashed bananas, sugar, melted butter, egg, and vanilla extract. Add the dry ingredients to the wet and whisk or stir until just combined.
1 cup mashed banana, ⅔ cup sugar, 5 tbsp melted butter, 1 large egg, 2 tsp vanilla extract
Fold in the chocolate chips until evenly distributed.
½ cup semisweet chocolate chips, ½ cup milk chocolate chips
Divide the batter between the muffin cups and top with extra chocolate chips and coarse sugar, if using.
coarse sugar
Bake for 18-20 minutes or until a toothpick inserted into the center of the muffin comes out clean. Let cool for 5 minutes in the pan before transferring to a wire rack to cool completely. Enjoy!