Chocolate Banana Crinkle Muffins

INGREDIENTS

1 1/2 cups

all-purpose flour

1 cup

granulated sugar

heaping 1/4 cup unsweetened natural cocoa powder

1 tsp

baking soda

1/4 tsp

baking powder

salt, optional and to taste

large egg

1/3 cup

canola or vegetable oil

1/4 cup

sour cream (lite is okay; Greek yogurt may be substituted)

1 tbsp

vanilla extract

1 1/2 cups

mashed ripe bananas (from about 3 medium/large bananas)

1 cup

mini semi-sweet chocolate chips (strongly recommended but regular size may be substituted)

about 1 teaspoon granulated sugar for each muffin, for sprinkling