Roberta'S Toffee Bars - cooking recipe

Ingredients

1 c. sugar (may use 1/2 light brown and 1/2 granulated) *
1 tsp. vanilla
1 3/4 c. flour
1 c. butter or margarine, softened
1 egg, separated
1/2 c. chopped pecans or walnuts

Preparation

*Original recipe calls for all granulated, also good with all brown sugar.