Heat the oil in a large saucepan set over medium-high heat. Add the onion & garlic and cook until just soft, about 8 minutes. Add the wine and cook for about 4 more minutes or until the liquid is reduced by half. Reduce the heat to medium and add the cream. Simmer gently, stirring frequently, for about 5 minutes or until the mixture starts to thicken slightly. Remove the pan from the heat. Stir in the Parmesan, Gorgonzola, mozzarella, and fontina cheeses, and season with salt & pepper.
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