Preheat oven to 400 degrees
Peel and cut apples into chunks. Set three apples aside.
Cook three apples in a medium saucepan with lemon juice and cinnamon. Cook until the apples are tender and caramelized.
Mix dry ingredients together. Flour, oatmeal, sugar, baking powder, baking soda and salt.
Add wet ingredients. Butter, apples, vanilla, applesauce, egg and milk.
Add batter generously to each muffin tin.
Add a scoop of cinnamon apples on top of each muffin and stir them in.
Top each muffin with additional oatmeal and sugar.
Cook for 20 minutes at 400 degrees
Remove muffins out of the oven. Let cook for a few minutes. These muffins are best when enjoyed when they are still warm.