INGREDIENTS
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1/2 c. (1 stick) unsalted butter, softened to room temperature
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1/2 c. granulated sugar
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1/2 c. packed light brown sugar
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1 large egg plus 1 additional egg yolk
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2 tsp. vanilla extract
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1/2 c. Biscoff spread (or Trader Joe's Speculoos Cookie Butter)
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2 1/4 c. all-purpose flour
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1 tsp. baking soda
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1/2 tsp. ground cinnamon
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1 tsp. cornstarch
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1/2 tsp. salt
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1 1/4 c. semi-sweet chocolate chips