LINE an 8-inch square pan with foil, letting ends extend above pan on 2 sides.
COMBINE evaporated milk, marshmallow creme, sugar and butter in a medium saucepan.
BRING to a boil, STIRRING constantly to prevent scorching; REDUCE heat to minimum and boil 5 minutes; REMOVE from heat.
STIR in chips until melted; STIR in vanilla and walnuts until blended.
POUR into lined pan; CHILL 2 hours or until firm.
LIFT foil by ends onto cutting board; CUT into squares.
This fudge can also be made with other flavored chips such as mint-chocolate, semi-sweet or peanut butter. STORE in refrigerator.
Per Serving (excluding unknown items): 259 Calories; 9g Fat (29.6% calories from fat); 3g Protein; 45g Carbohydrate; trace Dietary Fiber; 13mg Cholesterol; 56mg Sodium. Exchanges: 0 Grain(Starch); 0 Lean Meat; 0 Non-Fat Milk; 1 1/2 Fat; 3 Other Carbohydrates.