Chocolate Toffee Bars

1 cup margarine, room temperature
1 cup sugar
1 egg yolk
1 tsp. vanilla
2 cups flour
½ tsp. salt
1 pkg. semisweet chocolate pieces (6 oz.)
1 cup pecans, chopped

Heat oven to 350 degrees. Generously coat 13x9x2 baking pan with nonstick spray.

Beat together margarine, sugar, egg yolk and vanilla in medium size bowl until well blended. Mix in flour and salt. Press mixture into even layer in bottom of prepared baking pan.