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Combine the milk and cream in a saucepan over medium heat, and when the milk is boiling, slowly add in the butter-flour mixture and cook, stirring, until it has thickened into a sauce. Add salt and pepper to taste. Reserve 10 ounces of the bechamel sauce for the mac and cheese; set aside the remaining bechamel for another use.
For the mac and cheese: Preheat the broiler.
Add the reserved bechamel sauce to a 12-inch skillet over medium heat; mix in the macaroni, Cheddar, fontina and bacon. Add salt and pepper to taste. Transfer the mixture to a 16-ounce casserole dish (single-serving size).
Garnish with scallions and freshly ground black pepper and serve.