INGREDIENTS
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Unsalted butter, for greasing
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8 ounces macaroni
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2 1/2 cups cold milk
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4 ounces provolone cheese, coarsely grated
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4 ounces aged Asiago cheese, coarsely grated
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2 large eggs
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2 scallions, white and green parts, chopped
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3 slices white sandwich bread, torn into small pieces
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3 strips bacon
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1 medium onion, chopped
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1 clove garlic, minced
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3 tablespoons all-purpose flour
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1/8 teaspoon cayenne pepper
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Kosher salt