Preheat the oven to 350 degrees F. Set out a 9X5 loaf pan. Cut a strip of parchment paper 9 inches wide. Then fold it to fit down into the bottom and long edges of the pan. Spray or grease the pan and paper.
Smash the bananas and measure out 1 ½ cups.
Set out a large mixing bowl. Add the flour, oats, brown sugar, apple pie spice, salt, baking powder, and baking soda. Mix well. Then mix in the mashed banana, melted butter, eggs, milk, and vanilla extract. Mix until smooth.
Pour or scoop the batter into the prepared pan. Sprinkle the top with extra oats if desired. Then bake for 45-60 minutes, until a toothpick inserted deep into the center comes out clean.
Allow the bread to rest in the pan for 15 minutes. Then lift is out by the edges of the parchment paper. Wait until the loaf is fully cooled to cut.
VEGAN? This recipe is easily adjusted for vegan banana bread. Simply swap the butter for dairy-free butter spread or coconut oil. Swap the milk for almond or coconut milk. Then use "flax eggs" or a store-bought vegan egg substitute for the eggs.You can make flax or chai eggs by combing 6 tablespoons of water + 2 tablespoon ground seeds. Allow the mixture to sit and jellify for 10 minutes before using in the recipe.