Toffee Bars
["1 c. brown sugar", "1 c. butter, softened", "1 egg yolk", "1 tsp. vanilla", "2 c. flour", "1 tsp. salt", "1 (4 oz.) bar chocolate candy", "1/2 c. chopped nuts"]
["Heat oven to 350\u00b0.", "Mix brown sugar, butter, egg yolk and vanilla.", "Stir in flour and salt.", "Press into greased oblong pan, 13 x 9 x 2-inch."]
["brown sugar", "butter", "egg yolk", "vanilla", "flour", "salt", "nuts"]