Skillet Cobbler

2 cans pie filling
1 white or yellow cake mix
3 tablespoons butter
1 cup 7-Up®

Pour the pie filling into a cast iron skillet. Sprinkle the cake mix over the pie filling. Slice butter over the top, the pour the 7-Up® over everything. Bake at 350 degrees F for about 35 to 45 minutes.