In a bowl, stir together all cake ingredients. Pour into a greased 13x9-in. baking pan. Bake at 350° for 30 minutes or until cake tests done. Meanwhile, in a saucepan, mix sugar, milk and butter. Bring to a boil and boil for 1-1/2 minutes. Remove from the heat and stir in chocolate chips until melted. Pour over hot cake. Frosting will harden as it cools.
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