1. Heat oven to 350Â°F. Spray bottom only of 13x9-inch pan with cooking spray. In large bowl, mix butter, egg and vanilla until blended. Stir in cookie mix until soft dough forms. Press dough evenly in pan.
2. Bake 20 to 25 minutes or until top is golden brown and center puffs slightly. Immediately sprinkle chocolate chips over crust. Let stand 3 to 5 minutes or until chocolate begins to melt. Gently spread chocolate evenly over crust.
3. Set oven control to broil. Sprinkle nuts and marshmallows over melted chocolate. Broil with top 4 to 5 inches from heat 20 to 30 seconds or until marshmallows are toasted. (Watch closely; marshmallows will brown quickly.) Cool 30 to 45 minutes to serve warm or cool completely, about 2 hours. For bars, cut into 6 rows by 4 rows. Store tightly covered.
1 Bar: Calories 250 (Calories from Fat 100); Total Fat 12g (Saturated Fat 6g, Trans Fat 0g); Cholesterol 20mg; Sodium 140mg; Total Carbohydrate 33g (Dietary Fiber 1g, Sugars 22g); Protein 2g Percent Daily Value*: Vitamin A 2%; Vitamin C 0%; Calcium 2%; Iron 4% Exchanges: 1/2 Starch; 1 1/2 Other Carbohydrate; 0 Vegetable; 2 1/2 Fat Carbohydrate Choices: 2
*Percent Daily Values are based on a 2,000 calorie diet.