Preheat the oven to 425 degrees.
Line or grease the tins of a muffin pan.
Soak the oats in the milk for 5 minutes to soften them.
Add the flour, spices, salt, and baking powder to the oat mixture and stir to combine.
Add the brown sugar, egg, vanilla, maple syrup, butter, and applesauce to the dry ingredients and stir until the batter is just combined.
Mash the bananas and gently mix throughout the batter.
Use an ice cream scoop or tablespoon to distribute the batter into the tins.
Place the pan in the oven and lower the temperature to 350 degrees.
Bake for 18-20 minutes or until muffins are firm and golden brown.