In a large mixing bowl, combine the first seven ingredients. Beat at medium speed for 3 minutes. Pour batter into a greased 13x9x2-inch baking pan. Bake at 350 degrees for 30 minutes (top of brownies will still appear wet). Cool competely on a wire rack. In a mixing bowl, combine the filling ingredients until creamy. Spread over cooled brownies. Refrigerate until set. For the topping, melt chocolate chips and butter. Let cool for 30 minutes, stirring occasionally. Spread over filling. Chill. Cut into squares. Store in the refrigerator for a chilled taste.
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