Preheat the oven to 350℉
Mix the dry ingredients (rolled oats, cinnamon, and baking powder) in a small bowl until combined. Set aside.
In a separate bowl, whisk together the milk, applesauce, maple syrup and egg until combined.
Add in the dry ingredients and mix to combine. Let the oats soak up the wet ingredients for a few minutes as you prep the apple.
Peel and dice the apple into small pieces. Add the apple dices to the mixture and fold them in to combine.
Spoon in a tablespoon of the mixture into a muffin pan, repeat until muffin pan is full.
Bake at 350℉ for 20-25 minutes, or until the oats are crisp and slightly golden. Let them cool down before removing them from the pan and serving.