1 cup butter
½ cup brown sugar, firmly packed
1 beaten egg yolk
1 teaspoon vanilla
2 cups flour
4 tablespoons cornstarch
2 large Hershey's Milk Chocolate bars
Heat oven to 350 degrees. Mix butter, sugars, egg yolk, and vanilla. Add flour and cornstarch and blend well. Spread dough about 1/8"-1/4" thick on cookie sheet/s. Bake about 10 minutes or until golden brown. Crust should be soft. Remove from oven and immediately place separated squares of chocolate on top. Let stand until chocolate is melted and spread evenly over entire surface. Sprinkle with chopped nuts. Cut in small squares while still warm.