INGREDIENTS
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1 stick butter, softened
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1 1/2 cups light brown sugar
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1 egg
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1 teaspoon vanilla extract
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2 cups all-purpose flour
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3/4 cup Dutch process cocoa powder
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1 teaspoon baking soda
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1 teaspoon kosher salt
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1/2 teaspoon baking powder
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1/2 cup milk
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1/2 cup sour cream
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25 strawberries, hulled and sliced
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2 tablespoons granulated sugar
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1 bag large marshmallows