1Line 9-inch square pan with cooking parchment paper, leaving paper hanging over 2 opposite sides of pan. Spray paper with cooking spray.
2Make brownie batter as directed on box using water, oil and eggs. Stir in pretzels, caramel bits and peanuts. Pour batter into pan.
3Bake and cool as directed on box. Cut into 6 rows by 6 rows.