Preheat oven to 350F. Grease and line a 9x9" metal baking tin with parchment paper.
In a large bowl, whisk flour, kinako, baking soda, and salt. Set aside. If using the streusel from my kinako banana muffins recipe, prepare that at this time as well.
In another mixing bowl, mash bananas and add eggs, brown sugar, vanilla extract, melted butter, and Greek yogurt. Mix until well combined.
Add your dry ingredients to the banana mixture and gently mix until a batter forms.
Add in any optional mix-ins, such as chopped nuts or chocolate chips and gently fold to combine.
Pour the batter into your prepared baking tin. Sprinkle streusel on top, if using.
Bake for 45 minutes or until a toothpick inserted in the center comes out clean.
Allow the banana bread to cool slightly before slicing and serving. Leftovers keep in an airtight container at room temperature.