Nonstick cooking spray, for the loaf pan
1 overripe banana
2/3 cup sugar
8 tablespoons (1 stick) butter, melted and cooled
1/2 cup plain Greek yogurt
1 tablespoon orange juice
1 teaspoon vanilla extract
1 large egg
1 teaspoon baking soda
1/2 teaspoon kosher salt
1 1/2 cups plus 2 tablespoons all-purpose flour
1 cup diced ripe peaches
1 cup blueberries