Preheat oven to 350°F (175°C). Line a loaf pan with parchment paper or lightly grease it.
In a medium bowl, whisk together the all-purpose flour, cake flour, baking powder, and salt.
In a large bowl, mash the bananas, then mix in Greek yogurt, maple syrup, vanilla extract, and egg yolks.
In a separate bowl, beat the egg whites until soft peaks form.
Gently fold the dry ingredients into the banana mixture, followed by the whipped egg whites. Be careful not to overmix. Fold in the diced strawberries last.
In a small bowl, mix flour, sugar, melted butter, and cinnamon until crumbly.
Pour the batter into the loaf pan, then sprinkle the streusel evenly over the top. Bake for 45–55 minutes, or until a toothpick inserted in the center comes out clean. Tent with foil if browning too quickly.
Blend or mash the strawberries, then mix with maple syrup and lemon juice.
Let the bread cool completely before drizzling with the strawberry topping. Slice and enjoy!