Meanwhile, in 2-quart saucepan, mix 1 cup granulated sugar and the cocoa. Stir in milk, 1/4 cup butter and the corn syrup. Heat to boiling, stirring frequently. Boil 3 minutes, stirring occasionally; remove from heat. Beat in powdered sugar and 1 teaspoom vanilla with spoon until smooth and spreadable. Spread Fudge Frosting on cooled cake.