French Onion Mac & Cheese
INGREDIENTS
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6 tablespoons unsalted butter
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2 tablespoons olive oil
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3 large yellow onions, sliced (9 cups)
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1 pound cavatappi pasta
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1/4 cup all-purpose flour
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2 1/2 cups milk (I used 2%)
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2 cups shredded fontina cheese
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2 cups shredded asiago cheese
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8 ounces mascarpone cheese
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1 teaspoon salt
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2 cups croutons
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3 cups shredded gruyere cheese
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