All you need is one can of $1 Musselman's apple pie filling at the Dollar Tree. While you're there, pick up one of their $1 yellow cake mixes.
1 package yellow cake mix (regular size)
1 can apple pie filling
1/2 tsp cinnamon
1 cup butter, softened
3 cups confectioners' sugar
2 tablespoons heavy whipping cream
1 teaspoon vanilla extract
1-1/2 teaspoons ground cinnamon
Thinly sliced apples, optional
Prepare and bake cake mix according to package directions for cupcakes.
Place apple pie filling and 1/2 tsp. cinnamon in a mini food processor. Pulse several times to chop apples in 1/2 inch pieces.
Using a paring knife, cut a 1-in.-wide cone-shaped piece from top of each cupcake; discard removed portion. Fill cavity with apple mixture.
In a large bowl, combine all frosting ingredients; beat until smooth. Frost cupcakes. If desired, top with apple slices to serve.