Totally stole this from a site bigredkitchen.com. So easy! So good! and gluten free, right? They also suggested you could use chocolate cake mix.

One Cake mix- I used yellow
1 -15 ounce can pumpkin filling

Preheat oven to 350°. In a large bowl mix cake mix with pumpkin filling using a hand mixer or a stand mixer. Beat on medium for 2 minutes. Pour batter into a greased 7 x 11 inch baking dish. Bake for 28 minutes or until tooth pick comes out clean. Cool completely before frosting. Serves 8.

Apple Cider Glaze
1 cup powdered sugar
2 T. apple cider
1/2 t. pumpkin pie spice

In a small bowl blend all ingredients until smooth. Pour over Pumpkin Cake letting it drizzle down the sides of the cake. Let set before covering.