Preheat oven to 400 degrees F. Line muffin pan with liners. Set aside.
In medium bowl whisk together flour, oats, baking soda, and cinnamon. Set aside.
In a medium size pot, melt butter. Remove from heat.
Whisk into the melted butter the eggs, sugar, applesauce, vanilla and milk.
Stir butter mixture into the flour mixture.
Stir in apples.
Scoop into muffin liners.
In a small bowl mix together butter, flour, brown sugar, and cinnamon till it crumbles. Add a tablespoon of milk.
Evenly divide onto the top of each muffin, pressing down gently.
Bake 12 minutes.
Cool and ENJOY!