PREHEAT oven to 350° F. Grease 13 x 9-inch baking pan.
BEAT peanut butter, butter, brown sugar, granulated sugar and vanilla extract in large mixer bowl until creamy. Beat in eggs; beat in flour. Stir in 3/4 cup morsels. Spread into prepared baking pan.
BAKE for 20 to 25 minutes or until edges are lightly browned. Remove from oven; immediately sprinkle with remaining morsels. Let stand for 5 minutes; spread. Sprinkle candies over melted chocolate. Cool in pan on wire rack.