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Heat oven to 350 degrees.
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Mix one cup of sugar with the butter, 1 Tbsp. orange peel (and essential oil, if using) and egg together.
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Stir in flour, cocoa powder, salt, baking powder, and baking soda.
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Stir in chocolate chips and pecans (if using).
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Roll into 1-1 1/2 inch balls.
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Mix 1/3 cup sugar and 1 tsp. orange peel together in a separate bowl. Roll dough balls in mixture and place about three inches apart on a baking sheet. Flatten partially with the bottom of a glass. (These do spread a lot, so be sure to leave enough room!)
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Bake 9-11 minutes until the edges are just starting to crisp, but the centers are still a little soft. (If using stoneware, add another 2-3 minutes, especially for the first batch).
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Let cool slightly, then transfer to a wire rack to cool.