Step 1

Preheat oven to 350°F. Lightly grease a 9x5-inch loaf pan with non-stick cooking spray. Set aside.

Step 2

In a medium bowl, combine the flour, baking powder, baking soda, cinnamon, and salt. Set aside.

Step 3

In a large bowl, cream butter, white sugar, and brown sugar with an electric hand mixer or stand mixer with fitted paddle attachment until light and fluffy, about 2-3 minutes.

Step 4

Add eggs, one at a time, and beat well after each addition. Add vanilla extract and Greek yogurt. Beat well. Slowly add in flour mixture and beat until just combined. Gently fold in mashed bananas and blueberries. Pour batter into prepared pan. Set aside.

Step 5

To make the cinnamon streusel, in a small bowl, combine the brown sugar, white sugar, cinnamon, butter, and flour until thoroughly mixed. Sprinkle over top of batter.

Step 6

Bake for 55-65 minutes, or until toothpick inserted in center of bread comes out clean. Remove from oven and let cool in pan for 10 minutes, then remove to a wire rack and let cool completely.