Preheat oven and line muffin tins with paper liners.
Prepare batter according to box directions.
Fill liners 2/3 full and bake according to box directions for cupcakes.
Allow to cool completely.
Use a knife to dice apples into smaller pieces.
use a knife to core our a plug in the middle of each cupcake and fill with pie filling.
Place just the top of plug bake on cupcake.
Whip butter, brown sugar, cinnamon and vanilla for until fluffy.
Gradually add powdered sugar.
Add milk until you reach desired consistency.
Transfer to piping bag and frost each cupcake.