Reduce oven temperature to 300°F. Line bottom and sides of 13x9-inch pan with foil, leaving foil overhanging at 2 opposite sides of pan. Spray foil with cooking spray. In large bowl, beat cream cheese, peanut butter and sugar with electric mixer on medium speed until light and fluffy. Add eggs, one at a time, beating just until blended. Cut brownies into 1/2-inch pieces. Stir brownies into batter; pour into pan.