INGREDIENTS
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15 min. prep + cook time
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Butter , for greasing pan
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3/4 cup tightly-packed dark brown sugar
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1 cup Dutch cocoa powder , sifted
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1 1/2 cups all-purpose flour , plus more for dusting
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3/4 cup granulated sugar
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1 1/2 tsp. baking soda
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3/4 tsp. baking powder
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1 tsp cinnamon
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1 tsp. salt
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2 eggs
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1 egg yolk
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3/4 cup buttermilk
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1/4 cup butter-softened
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1/4 cup non-fat greek yogurt
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1 tsp. vanilla
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8 ounces semisweet (60 percent) chocolate chunks or chips