Preheat oven to 350 degrees.

Line a standard 12-cup muffin tin with baking cups.

In a medium bowl, whisk together flour, baking powder, salt, and cinnamon.

In a separate bowl, whisk together banana, sugar, egg, butter, and milk.

Stir wet ingredients into dry ingredients

Stir in mini chocolate chips.

Divide batter evenly between prepared cups, adding a scant 1/4 cup to each.

Bake until tops spring back when lightly touched, about 20 minutes.

Cool in pans 5 minutes, then remove to wire rack to cool completely.