"Smear the bread with mayo on both sides and then grill in butter for the ultimate golden-brown crunch...."
INGREDIENTS
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8 slices sourdough or white bread
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1/4 cup mayonnaise
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1 1/2 cups grated mozzarella
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1 1/2 cups grated Gruyère
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1/2 cup grated aged goat cheese (such as Midnight Moon from Cypress Grove Chevre)
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3 ounces thinly sliced prosciutto
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6 tablespoons (3/4 stick) unsalted butter