In a large bowl mix sugar, butter, egg yolk and vanilla by hand with a wooden spoon. Stir in the flour and salt. Spread this mixture in a 9 X 13 pan that has been sprayed with butter spray. Bake 25 - 30 minutes until light, golden brown. Remove from oven and immediately place the chocolate bars in a row down the center of the dough. They will melt quickly. Spread the melted chocolate across the surface of the bar dough. Sprinkle with the nuts if you choose to use them. Cut into squares. These are wonderful warm or room temperature
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