Toffee Bars - cooking recipe

Ingredients

1 c. butter
1 c. packed brown sugar
1 egg yolk
2 c. flour
1 tsp. vanilla
1 (12 oz.) pkg. chocolate chips (semi-sweet)
1 to 1 1/2 c. chopped walnuts

Preparation

In a large bowl, with an electric mixer, beat butter and brown sugar until fluffy.
Mix in egg yolk, flour and vanilla.
Spread dough into a 15 x 10 x 1-inch jelly roll pan.
Bake in preheated 350\u00b0 oven 15 minutes.