Instructions: Preheat oven to 325 degrees. Line large cookie sheet with parchment paper and grease or coat with cooking spray. Re-sift the flour with salt and nutmeg or cinnamon into a small bowl and set aside. Cream the butter, shortening and sugar in a large bowl with an electric mixer on high for 1 minute. Add the egg yolk and mix until light and fluffy, about 2 minutes. Reduce speed to medium-low and add flour mixture slowly until just blended. Scrape dough out onto prepared cookie sheet and press out in a rectangular shape about 1/4 inch thick. Press on the nuts if using. Bake for 25-30 minutes until slightly puffy and light brown around the edges, rotating the cookie sheet halfway through the baking time. Cut into squares and let cool on cookie sheet.

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