Moist Banana Streusel Muffins

INGREDIENTS

• cooking spray
• 1 1/2 cups sifted whole wheat flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1/2 teaspoon ground cinnamon
• 3 ripe bananas, mashed
• 1/2 cup unsalted butter, melted
• 1 large egg
• 3/4 cup white sugar
• 1 teaspoon vanilla extract
• 1/4 cup packed dark brown sugar
• 2 tablespoons whole wheat flour
• 1 tablespoon unsalted butter