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In a bowl sift together flour, corn starch, baking powder and salt.
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Using a hand beater or an electric mixer, mix together melted butter and sugar.
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Add flour mixture to butter and sugar, mix until combined.
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Add egg and milk, and mix to combine.
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Gradually add flour mixture to butter/sugar mixture until fully combined.
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Line a 9x13 inch pan with parchment paper or foil.
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Press bottom layer into the bottom of the pan.