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Preheat oven to 350 degrees. Line two cookie sheets with parchment paper.
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Blend together butter, tahini, sugars and extract until light and fluffy, about 5 minutes on medium speed
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Add egg and mix for an additional 3 minutes
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In a separate bowl, combine flour, baking soda, baking powder and salt
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Stir flour mixture into butter mixture; mix until combined
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Stir in chocolate
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Spoon dough onto a lined cookie sheet 2 inches apart
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Sprinkle with sesame seeds and flaked sea salt
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Bake for 10-12 minutes or until edges begin to turn a golden color
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When removing from the oven tap the pan on the stove to deflate the cookies.
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Cool on pan for 5 minutes then transfer to a wire cooling rack to cool completely.