Mix the apples with flour, sugar, cinnamon, and nutmeg.
Unroll your first pie crust and cut several circles out. A wide mouth mason jar ring works perfectly. Continue this until you have enough crusts.
Line each cup of your muffin tin with a tiny pie crust. Pinching the edge of the dough around the top edge of the tin and making a hammock of sorts works really well.
Gently fill the crusts with the apple mixture and push the crusts down the rest of the way. Fill until slightly mounded.
Take your equally divided butter and put a dab on each pie.
Cover as desired with left over dough. Brush with melted butter.
Bake at 400 for 18 to 22 minutes. Start checking at 10 minutes and checked every two until they are perfect.