Preheat oven to 350° F.

Combine flour, sugar and brown sugar. Mix in butter until thoroughly blended. Add egg yolks and vanilla. Mix until smooth or blend in food processor until mixture comes together.

Transfer mixture to a jelly roll pan. Bake for 13-18 minutes. (should be light golden)

Melt chocolate in a glass bowl. On the stovetop or in the microwave a few minutes before oven is done baking.

Remove from oven and let cool for 20 minutes. Spread melted chocolate over base. Sprinkle nuts on top. Press in lightly. Cool until chocolate sets. Cut into squares or triangles.