Yuletide Toffee Squares
["4 1/2 c. Quaker oats (uncooked)", "1 c. packed brown sugar", "3/4 c. margarine, melted", "1/2 c. dark corn syrup", "1 Tbsp. vanilla", "1/2 tsp. salt (optional)", "12 oz. pkg. semi-sweet chocolate pieces", "2 Tbsp. shortening", "2/3 c. chopped nuts"]
["Heat oven to 450\u00b0.", "Grease 15 x 10-inch pan.", "Combine oats, sugar, margarine, corn syrup, vanilla and salt; mix well.", "Firmly press mixture into pan.", "Bake 12 minutes or until mixture is brown and bubbly.", "Cool completely."]
["oats", "brown sugar", "margarine", "corn syrup", "vanilla", "salt", "semi-sweet chocolate pieces", "shortening", "nuts"]