This recipe for the simplest oat flour banana muffins creates moist and banana-laden muffins that are packed with walnuts and have the tenderest crumb! All you'll need is naturally gluten-free oat flour, melted butter, and a few cozy spices including cinnamon and ginger.
Line a 12-count muffin pan with cupcake liners or well grease with oil.
In a medium bowl, whisk together the oat flour, baking powder, baking soda, salt, cinnamon, and ginger. In a large bowl, whisk together melted butter, mashed bananas, brown sugar, egg, and milk. Pour the dry ingredients into the wet ingredients, then stir until until combined. Fold in the walnuts if using.
Divide the batter equally between the muffin tins into liners. Preheat the oven to 350°F and let the batter rest while the oven heats. Then bake the muffins for 30-35 minutes, until a tester comes out clean and the tops are slightly firm. Remove from the oven, cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.