Preheat the oven to 450 degrees. Lightly grease a large baking dish.
Cook the linguine according to package directions. Drain and set aside.
Meanwhile, in a large saute pan, melt the butter. Add the garlic and cook until fragrant, 1-2 minutes. Whisk in the flour until smooth.
Gradually whisk in the chicken broth and milk, stirring until smooth. Cook and stir for about 5 minutes, or until sauce has thickened. Reduce heat and add half of the mozzarella and Parmesan cheeses. Season with herbs de Provence, nutmeg, salt and pepper, to taste.
Combine the sauce with the cooked linguine and toss to coat well. Transfer the pasta to the prepared baking dish. Sprinkle with the remaining cheeses.
Bake for 15-20 minutes or until bubbly and golden brown. Let stand 5-10 minutes before serving. Sprinkle with fresh parsley for garnish.