01 - 
                Preheat oven to 350°F. Grease 8x4-inch loaf pan generously with cooking spray.
              
              
              
                02 - 
                In large bowl, combine mashed bananas, melted butter, sugar, egg, and vanilla.
              
              
              
                03 - 
                Whisk together gluten-free flour, baking soda, baking powder, and salt in separate bowl.
              
              
              
                04 - 
                Add dry ingredients to wet ingredients and stir until fully combined. Batter will be slightly lumpy.
              
              
              
                05 - 
                Pour batter into prepared pan. Bake 50-60 minutes until tester comes out clean.
              
              
              
                06 - 
                Cool on rack 15 minutes before removing from pan. Cool completely before slicing.