Step 1

Preheat the oven to 325° F. Add 1/2 cup (1 stick) of the butter and the brown sugar to a well-seasoned, medium (about 10.25") cast-iron skillet. Place the skillet over medium heat, and stir until the butter is melted and the mixture is combined. Remove from the heat.

Step 2

Melt the remaining 1/2 cup (1 stick) butter in a small bowl in the microwave. In a large bowl combine the cake mix, eggs, melted butter and 1 cup water. Mix well.

Step 3

Place the sliced apples in the skillet on top of the caramel mixture arranging them in whatever fashion you like. Pour the cake batter on top of the apples. Bake 45 to 50 minutes or until a toothpick inserted in the center comes out clean. Immediately cover the skillet with a platter and invert to remove the cake.