Apple Dump Cake

Bahan-bahan (12 porsi)

• 15.25 ounces vanilla cake mix (white cake, yellow cake or spice cake mix)
• 42 ounces apple pie filling (2 x 21 ounces each)
• 3 large apples (optional)
• ¾ cup melted butter
• ½ teaspoon cinnamon (or to taste, or 1 tablespoon cinnamon sugar)