1 c. evaporated milk
2 c. miniature marshmallows
1 (6 oz.) pkg. Toll House chocolate bits
1/2 c. sugar
1/4 tsp. salt
1 tbsp. butter and butter
1 tbsp. vanilla
1 c. walnuts, chopped
2 pkg. Nabisco graham crackers

Cook first 5 ingredients until melted. Cook and stir to a full boil for 5 to 6 minutes. Remove from heat and gradually stir in remaining ingredients. Press into 9-inch buttered pan. Chill 1 hour.