Preheat oven to 425F degrees. Line muffin tin with baking cups or spray with nonstick spray. Set aside.

Make the streusel first by combining all ingredients in a small bowl. Set aside.

For the muffins: mix the flour, cinnamon, baking soda, baking powder, and salt. Set aside. Using an electric stand or hand mixer, beat the sugar, butter, and egg in a large bowl until fluffy, scraping down the sides as needed.

On low speed, beat in the mashed bananas and yogurt. By hand, stir in the dry ingredients mixing until everything is *just* combined. Do not overmix

Layer one scant Tablespoon of batter into the muffin cup. Sprinkle with streusel. Layer another spoonful on top and layer with more streusel. Continue to layer.

Bake muffins for 5 mins at 425F degrees. Lower temp to 350F degrees and continue baking for 14 mins until muffins are set and lightly browned.

Allow to cool for 5 mins in the tins and transfer to wire rack to cool completely.