INGREDIENTS
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1 1/2 cups all-purpose flour, lightly spooned into measuring cups and leveled with a knife
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2 cups sugar
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1/2 cup unsweetened cocoa powder
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2 teaspoons baking powder
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1/2 teaspoons table salt
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1 cup (2 sticks) melted butter (no substitutions)
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3 eggs, lightly beaten
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1 tablespoon vanilla extract
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1 cup dark or semi-sweet chocolate chips or chunks
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3 cups mini marshmallows (or enough flat marshmallows to cover a 9x13" pan)
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1/2 cup melted butter
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1/3 cup unsweetened cocoa powder
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1/3 cup evaporated milk or whole milk
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1 pound powdered sugar
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1 teaspoon vanilla