"These moist, ultra-chocolate muffins become tiny molten marshmallow volcanoes as they bake. For a less marshmallowy, more fudgy effect, use halved marshmallows in place of whole ones...."
INGREDIENTS
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2 ounces unsweetened chocolate, chopped
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6 tablespoons unsalted butter
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1 3/4 cups all-purpose flour
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2/3 cup sugar
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1/3 cup unsweetened cocoa powder (NOT Dutch process)
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1 tablespoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1 1/4 cup buttermilk or unsweetened yogurt
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1 egg
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1 teaspoon vanilla
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1/2 cup fine quality bittersweet chocolate chips, plus more for topping