INGREDIENTS
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Topping/Filling
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4 tablespoons cold butter, cut in cubes
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⅓ cup light brown sugar, well packed
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¾ cup all purpose flour
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1 teaspoon cinnamon
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¼ teaspoon table salt
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3 ounces bittersweet chocolate, coarsely chopped
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Cake
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2 cups all purpose flour
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2 teaspoons baking powder
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½ teaspoon baking soda
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¾ teaspoon kosher salt
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1 teaspoon cinnamon
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6 ounces [1 & ½ sticks] softened butter
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½ cup light brown sugar, well packed
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½ cup granulated sugar
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2 large eggs
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2 teaspoons pure vanilla extract
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1 & ½ cups Greek yogurt