11.Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom only of 9-inch square pan with cooking spray or shortening. Make brownies as directed on box-- except after removing from oven, immediately sprinkle with marshmallows. Bake 1 to 2 minutes longer or until marshmallows just begin to puff.
2.In 3-quart saucepan, heat corn syrup, butter, vanilla and peanut butter chips over medium heat 3 to 4 minutes, stirring constantly, until chips are melted. Remove from heat; stir in cereal and peanuts. Spread evenly over marshmallows. Refrigerate 45 minutes or until firm. For brownies, cut into 5 rows by 5 rows. Store in refrigerator.