Preheat your oven to 190°C (375°F) and spray a muffin tray with baking spray.
In a large bowl, mix together flour, sugar, rolled oats, cinnamon, baking powder, baking soda, and salt.
In a separate bowl, mash the overripe bananas and then add the eggs, oil, and vanilla. Mix until combined.
Pour the wet mixture into the dry ingredients and gently fold until just combined.
Fill each muffin cup about two-thirds full with the batter.
In a small bowl, mix together rolled oats, cinnamon, brown sugar, and melted butter for the topping.
Sprinkle the topping evenly over each muffin.
Bake for about 20 minutes, or until the muffins spring back when touched and the topping is lightly golden.
Let the muffins cool in the tray for about 5 minutes, then transfer to a wire rack to cool completely.
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Notes
Store muffins in an airtight container at room temperature for up to 2 days or refrigerate for up to a week. They can also be frozen for up to 3 months.