Whisk together the flour, rolled oats, sugar, baking soda, baking powder, cinnamon, and salt. Mash the bananas separately.
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Combine the mashed banana, vegetable oil, milk, egg, and vanilla extract. Add the dry ingredients to the wet mixture and stir. Then, fill the muffin tin.
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Now, make the topping. Sprinkle the crumb mixture over the top of the muffins. Bake and let cool.
3