Preheat oven to 350 degrees F. Combine cake mix, egg, and butter. Mix well. Pat mixture in the bottom of a lightly greased 13 x 9 inch baking pan. Prepare filling in a large bowl. Beat cream cheese until smooth. Add eggs, vanilla, and butter. Beat together, add powdered sugar and mix well. Spread over cake batter and bake for 40 - 50 minutes. Do not overbake. Center of cake should be gooey.
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