Preheat oven to 350F degrees. Spray a 9"x13" baking pan with non-stick cooking spray.
In a bowl, mix together the cake mix with one egg and one stick melted butter.
Press this mixture into the bottom of prepared baking dish and slightly up the sides, then set aside.
In another bowl beat the cream cheese until smooth. Add in the eggs, vanilla, cinnamon and remaining melted stick of butter and beat until blended.
Mix in the powdered sugar and continue to mix until incorporated. Spread on top of the cake mix batter in the baking dish.
Bake for about 30 minutes or until center is set but still gooey. Remove from oven and let cool.
Sprinkle with powdered sugar if desired.
Notes
The trick for gooey butter cakes is to not over-bake them. It’s called gooey for a reason. You don’t want a burnt cheesecake filling. We want it to stay soft-set.
You can easily make these with any cake mix flavor. It’s incredibly easy to switch up.
I like to use salted butter to offset a bit of the sweetness. You can certainly use unsalted butter if that’s all you have.