Gluten-Free Banana Oatmeal Muffins

Preheat the oven to 400 degrees F (200 degrees C). Line a 12-cup muffin tin with parchment baking cups.

Combine flour, oats, sugar, baking powder, baking soda, and salt in a bowl.

Beat egg lightly in a large bowl. Stir in milk, applesauce, and vanilla extract. Add mashed banana and combine thoroughly. Stir flour mixture into the banana mixture until just combined. Divide batter evenly between the prepared muffin cups.

Bake in the preheated oven until a toothpick inserted into the center of a muffin comes out clean, 18 to 20 minutes.