1Heat oven to 350°F (325°F for dark or nonstick pan). Line bottom and sides of 9-inch square pan with foil, leaving foil overhanging on 2 opposite sides of pan. Spray foil with cooking spray.
2In medium bowl, stir brownie mix, oil, water and eggs until well blended. Stir in 1/3 cup of the chopped cashews and 1/3 cup of the chopped candy bars. Spread evenly in pan. Sprinkle remaining 1/3 cup cashews and 1/3 cup candy bars evenly over batter.
3Bake 35 to 38 minutes or until toothpick inserted 2 inches from side of pan comes out almost clean. Cool completely, about 1 hour. Remove brownies from pan, using foil to lift. Cut into 6 rows by 4 rows.