"A floured surface is key to help you handle the cookie dough when rolling into logs. The logs of cookie dough must be chilled in the refrigerator for at least 4 hours or even up to a few days (or even frozen!) so it's really easy to just take them out when you need them, slice, and bake them...."
INGREDIENTS
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3/4 cup (170g) unsalted butter
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2/3 cup (133g) packed light or dark brown sugar
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1 large egg, at room temperature
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1 teaspoon pure vanilla extract
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2 cups (250g) all-purpose flour(spoon & leveled)
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1/2 teaspoon ground cinnamon
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1/4 teaspoon salt
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1 cup (120g) toasted and finely chopped Diamond of California hazelnuts, divided1
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optional: coarse sugar for rolling
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8 ounces (226g) milk chocolate, coarsely chopped2