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1
Preheat oven to 350u00b0.
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2
To roast garlic: Slice 1/2 inch off the top of the entire head of garlic. Drizzle with olive oil and sprinkle with salt and pepper. Wrap garlic head tightly in a square of heavy foil and roast until tender - about 45 minutes. Remove garlic pulp by squeezing garlic head. Smash cloves with a fork to form a paste.
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3
Cook pasta according to package directions.
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4
Cook bacon completely. Drain on paper towels. Reserve 1 tablespoon of bacon fat. Crumble bacon when cool.
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5
To make topping: Combine breadcrumbs, crumbled bacon, Parmigiano Reggiano cheese, and 2 tablespoons of melted butter. Set aside.
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6
Preheat oven to 375u00b0.
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7
Saute shallots over low heat in reserved bacon fat for one minute. Add remaining 6 tablespoons of butter and continue to saute shallots in butter and bacon fat until translucent.
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8
Add flour and continue to cook for 1-2 minutes. Increase heat to medium. Stirring constantly with a whisk, add milk and roasted garlic paste.
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9
Cook until sauce is thickened (coats the back of a spoon). Remove sauce from heat then add salt, pepper, nutmeg, Gruyere and Cheddar cheeses. Taste and adjust salt and pepper if necessary.
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10
Stir in cooked pasta. Pour into baking dish. Sprinkle topping to cover entire top. Cover with foil and bake 15 minutes. Remove foil and continue baking until sauce is bubbly and topping is browned. Enjoy!
