Preheat oven to 350°. Prepare brownie mix according to package. Stir in chopped cookies. Spread batter in greased pizza pan and bake 18 to 20 minutes. Sprinkle marshmallows over top of brownies, return to oven and bake 3 to 5 minutes, or until marshmallows soften. Sprinkle with nuts and candies, pressing lightly into softened marshmallows. Cool slightly on wire rack, then cut into wedges.
