Preheat oven to 350 degrees. Mix together butter, eggs, and cake mix in a medium-sized bowl. Press into a greased 9x13 inch baking pan.
Bake at 350 degrees for 30 to 35 minutes or until the top is lightly browned. Remove cake from oven, allow to cool.
Prepare the frosting by mixing together the cream cheese and powdered sugar in a medium-sized bowl. Beat until smooth and creamy with a mixer. Spread frosting on the cake.