PREHEAT oven to 350F.
MELT butter; SPREAD in 13 x 9-inch baking pan.
SPREAD graham cracker crumbs; LAYER the chips, walnuts, and coconut.
DRIZZLE condensed milk on top.
BAKE until barely golden, about 20-25 minutes.
COOL on rack; CUT into 2 x 1 1/2 inch squares.
Serve plain or topped with ice cream, marshmallow cream, or hot fudge sauce.
Per Serving (excluding unknown items): 1064 Calories; 36g Fat (29.8% calories from fat); 24g Protein; 168g Carbohydrate; 2g Dietary Fiber; 99mg Cholesterol; 408mg Sodium. Exchanges: 1/2 Grain(Starch); 0 Lean Meat; 0 Fruit; 7 1/2 Fat; 10 1/2 Other Carbohydrates.