3cups powdered sugar, plus additional to dust over the cake
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Preheat oven to 350 degrees. Spray a 9x13-inch pan with nonstick spray.
In a medium bowl, mix together the cake mix, eggs, melted butter, oil, and vanilla. This batter will be thick. Press into the bottom of the baking pan.
Using a handheld or stand mixer, beat cream cheese, eggs, and vanilla extract for 1-2 minutes, until smooth. Add in powdered sugar and beat on low until mixed in, and then increase speed to high for an additional minute.
Pour the cream cheese filling over the cake batter.
Bake 28-35 minutes, or until filling is set. The edges should be brown but the center should still look gooey.
Remove from oven and cool completely before serving.
Pumpkin Gooey Butter Cake: Add 1 can of pumpkin puree, 8 tablespoons of melted butter, 1 teaspoon cinnamon, and ½ teaspoon nutmeg to the filling.
Lemon Gooey Butter Cake: Use a lemon cake mix, and add ¼ cup lemon juice and 1 teaspoon lemon zest to the filling.
Chocolate Gooey Butter Cake: Use a chocolate cake mix. Add ¼ cup of cocoa to the filling.
Cinnamon Gooey Butter Cake: Mix together 3 tablespoons of granulated sugar and 1 ½ teaspoons of cinnamon together, and sprinkle over the topping before baking.
Red Velvet Gooey Butter Cake: Use a red velvet cake mix.
Strawberry Gooey Butter Cake: Use a strawberry cake mix. Top with sliced fresh strawberries.