Meanwhile, heat the milk in a small saucepan, but don't boil it. Melt the butter in a medium pot and add the flour. Cook over low heat for 2 minutes, stirring with a whisk. While shisking, add the hot milk and cook for a minute or 2 more, until thickened and smooth. Off the heat, add all 3 cheeses, 1 tsp salt, pepper, and nutmeg. Add the cooked pasta and crumbled bacon and stir well. Pour into baking dish.
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