Servings: 2 dozen

1 package yellow cake mix (regular size) 1 package yellow cake mix (regular size)
2 tablespoons butter 2 tablespoons butter
4 medium tart apples, peeled and finely chopped (about 4 cups) 4 medium tart apples, peeled and finely chopped (about 4 cups)
3/4 cup packed brown sugar ¾ cup packed brown sugar
1 tablespoon cornstarch 1 tablespoon cornstarch
1 tablespoon water 1 tablespoon water
 
FROSTING: subheading: FROSTING:
1 cup butter, softened 1 cup butter, softened
3 cups confectioners' sugar 3 cups confectioners' sugar
2 tablespoons heavy whipping cream 2 tablespoons heavy whipping cream
1 teaspoon vanilla extract 1 teaspoon vanilla extract
1-1/2 teaspoons ground cinnamon 1-½ teaspoons ground cinnamon
Thinly sliced apples, optional Thinly sliced apples, optional

Prepare and bake cake mix according to package directions for cupcakes.
In a large skillet, heat butter over medium heat. Add apples and brown sugar; cook and stir until apples are tender, 10 to 12 minutes. In a small bowl, mix cornstarch and water until smooth; stir into pan. Bring to a boil; cook and stir until thickened, 1 to 2 minutes or. Remove from heat; cool completely.
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.

I tend to add more cinnamon to frosting.  I tend to add more cinnamon to frosting.