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1
Place a 6-in. cake pan or small ovenproof saucepan in the center of a 10-in. cast-iron skillet. Cut each roll into thirds; roll each piece into a ball. Place along outer edge of skillet. Gently stack remaining balls on top of bottom layer, leaving some space between them. Cover and let rise until almost doubled, about 30 minutes.
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2
Preheat oven to 400u00b0. Microwave butter, garlic powder and red pepper flakes, covered, until butter is melted. Brush half of butter mixture over dough. Reserve remaining butter mixture.
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3
Bake until dough balls are set and beginning to brown, 15-18 minutes. Remove cake pan from skillet. Meanwhile, in a small skillet, heat butter over medium-high heat. Add mushrooms; cook and stir until tender, 5-7 minutes. Add garlic; cook 1 minute longer.
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4
In a large bowl, combine the mayonnaise, cream cheese, 3/4 cup mozzarella cheese and 1/2 cup Parmesan cheese. Add the mushroom mixture, artichokes and spinach.
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5
Spoon dip into center of skillet; sprinkle with red pepper and remaining 1/4 cup mozzarella. Brush rolls with remaining butter mixture; sprinkle with remaining 2 tablespoons Parmesan. Bake until dip is heated through and rolls are golden brown, 10-15 minutes. If desired, sprinkle with additional red pepper flakes.
