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Heat oven to 350 degrees.
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Combine the cake mix, egg, and butter. Mix well.
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Pat the mixture down into a sprayed 9x13 pan. Set aside.
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To make the filling, beat the cream cheese and pumpkin, in a bowl, until smooth.
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Add the eggs, vanilla, and butter. Beat together.
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Add the powdered sugar, cinnamon, nutmeg, mix well.
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Spread pumpkin mixture over cake batter crust.
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Bake about 40 - 50 minutes.
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Serve with whipped cream on top.
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* Be careful not to overbake, the top will look perfect, but the bottom layer of crust will be too toasty. The cake should have a slight wiggle and be "gooey".