In a large bowl mix the spice cake mix and the pumpkin puree together.
Get out your baking pan. You can use a 9x13 pan, a bundt cake pan or 2 square cake pans and spray the pan with a non stick spray. Then pour the cake batter in to it.
Bake the cake at 350 for 15 minutes. Depending on your oven the cake might need a little bit more time. Check the cake by testing it with a fork or a toothpick. If it comes out clean then you know it is fully baked.
Once the cake is finished baking you can let it cool and enjoy it without frosting or you can frosting the cake before enjoying it.