Banana Chocolate Chip Muffins with Cinnamon Streusel

INGREDIENTS

and 1/2 cups all-purpose flour

1/2 tsp

ground cinnamon

3/4 tsp

baking soda

3/4 tsp

baking powder

1/4 tsp

salt

1/2 cup

granulated sugar

6 tbsp

unsalted butter, softened to room temperature

large egg

and 1/2 cup mashed bananas, very ripe (about 3 large ripe bananas)

3 tbsp

yogurt (I used vanilla greek yogurt)

1 tbsp

ground cinnamon

1/4 cup

packed light brown sugar (or dark brown sugar)

3/4 cup

semi-sweet chocolate chips

1/2 cup

chopped walnuts, optional