"There is no denying it, this is truly the Ultimate Grilled Cheese Sandwich. You see, when we made it, this dish disappeared so fast in our Test Kitchen it barely even had time to cool!..."
INGREDIENTS
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3/4 cup mayonnaise
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3 ounces cream cheese, softened
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1 cup shredded Cheddar cheese
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1 cup shredded mozzarella cheese
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1/2 teaspoon garlic powder
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10 slices sourdough bread
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4 tablespoons (1/2 stick) butter, softened