Preheat oven to 350. Prepare a 14" pizza pan with cooking spray. Prepare brownie mix according to package directions and spread batter evenly over bottom of prepared rimmed pizza pan. Bake for 25 minutes. With a wet table knife, spread marshmallow cream evenly over brownie layer. Sprinkle with chocolate chips and walnuts.

Per serving: 278 Calories; 6g Fat (17% calories from fat); 4g Protein; 57g Carbohydrate; 0mg Cholesterol; 174mg Sodium