Heat oven to 350 degrees F. Spray a 12-inch pizza pan with cooking spray.
In a large mixing bowl, combine brownie mix, flour, water, oil, and egg.
Beat by hand for about 1 minute, or 50 strokes. Stir in peanuts or chocolate
chips. Spread batter in the pan and sprinkle with M&M's or Reese's
Bake for about 18 to 25 minutes, or until a toothpick inserted into the
center comes out clean.
Remove from oven and immediately sprinkle with marshmallows.
Cool for 15 to 20 minutes then drizzle with caramel sauce.