Pumpkin Bars "The Bestest Ever"

I've been eating/making/enjoying these for 30 plus years. It's the recipe to which I compare all others. The recipe that is worn from all the ingredients spilling over. The recipe that screams "IT'S THE HOLIDAYS!!!!!"

1 Yellow Cake Mix
1 Can Pumpkin Pie Mix
3 Eggs
2/3 Cup Evaporated Milk
3/4 Cup Butter
1/4 Cup Sugar
1 Teaspoon Cinnamon

1. Pour dry cake mix in bowl. Measure 1 cup and set aside. Add 1/2 cup butter and 1 egg to remaining cake mix. Mix well. Grease 9x13 inch baking pan. Spread mixture evenly.

2. Mix 1 can pumpkin pie mix, 2 eggs and 2/3 cups evaporated milk. Pour over cake mixture.

3. Mix remaining 1 cup dry cake mix, 1/4 butter, 1/4 sugar, and 1 teaspoon cinnamon together until crumbly- is that a word? Sprinkle evenly on top of pumpkin pie mixture.

4. Bake at 350 for 40-50 minutes. Cool. Eat-It's really good topped with whipped cream. Enjoy!