1 (18.25 ounce) package yellow cake mix
1 (3.5 ounce) package instant butter cake mix
1 (8 ounce) package cream cheese
16 ounces frozen whipped topping, thawed
2 (14 ounce) cans cream cheese and heavy cream cheese blend
Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9 inch cake pan.
In a large bowl, mix together the yellow cake mix, cream cheese, whipped topping, and cream cheese. Mix well and pour mixture into the prepared pan.
Bake in the preheated oven for 15 minutes, or until a toothpick inserted into the center of the cake comes out clean. Chill in the refrigerator before cutting into squares.