English Toffee Cookies
["2 sticks butter, softened", "1 c. sugar", "1 egg, separated", "2 c. flour", "1 tsp. salt", "1/2 c. nuts, chopped"]
["Cream together butter with sugar.", "Add unbeaten egg yolk.", "Add flour and salt.", "Spread dough into 9 x 13-inch greased glass pan. Beat egg white until stiff and spread over dough.", "Sprinkle nuts on top.", "Bake at 325\u00b0 for 20 to 25 minutes.", "Cut while still warm."]
["butter", "sugar", "egg", "flour", "salt", "nuts"]