Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Line a muffin tin with paper liners or grease it lightly with oil to prevent the muffins from sticking.
Mash the Bananas: In a large mixing bowl, mash the ripe bananas with a fork or potato masher until smooth. The more ripe the bananas are, the easier this step will be, and they’ll provide more natural sweetness for the muffins.
Mix Wet Ingredients: Add the eggs, applesauce, milk, and vanilla extract to the mashed bananas. Stir everything together until fully combined.
Combine Dry Ingredients: In a separate bowl, combine the rolled oats, baking soda, ground cinnamon, and salt. Stir the dry ingredients together so everything is evenly distributed.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet banana mixture, stirring gently until the mixture is well combined. Be careful not to overmix, as this can make the muffins dense.
Add Nuts (Optional): If you’re adding chopped walnuts or almonds, fold them into the batter at this stage for an extra crunch.
Spoon Into Muffin Tin: Divide the muffin batter evenly among the muffin cups, filling each about 3/4 of the way full. You can sprinkle a few extra oats or chopped nuts on top for a decorative touch if you like.
Bake: Place the muffin tin in the preheated oven and bake for 18–22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Cool: Allow the muffins to cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely.