Beat peanut butter, butter, brown sugar, sugar and vanilla in large mixer bowl until creamy. Beat in eggs, add flour. Stir in 3/4 cup chocolate chips. Spread into greased 13 x 9-inch baking pan. Bake in preheated 350 degree oven for 20 to 25 minutes or until edges are lightly browned. Remove from oven; immediately sprinkle with remaining chips. Let stand for 5 minutes; spread. Sprinkle colored sugar over melted chocolate. Cool in pan on wire rack.
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