Potluck pasta! Baked Pasta with Sausage, Mushrooms and Fontina Cheese

The sausage-mushroom mixture can be made a day ahead and refrigerated in an airtight container. Rewarm over low heat before combining with the pasta.
2 tablespoons extra-virgin olive oil, divided
12 ounces sweet Italian sausage, casings removed
1 pound cremini mushrooms, trimmed, and quartered
½ cup sliced shallots
4 teaspoons minced fresh garlic
2 teaspoons minced fresh rosemary
1⁄3 cup dry white wine or reduced-sodium chicken broth
1 teaspoon coarse salt, divided
Freshly ground black pepper
3 tablespoons unsalted butter
3 tablespoons all-purpose flour
2 cups 2-percent reduced-fat milk
1 pound rigatoni
1 (14-ounce) can crushed tomatoes with purée
6 ounces Italian fontina, shredded
6 tablespoons freshly grated Parmigiano Reggiano cheese
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Heat 1 tablespoon oil in a large sauté pan over medium heat; add sausage. Cook, breaking up meat with a spoon until no longer pink and beginning to brown. Transfer to a plate with a slotted spoon; pour off drippings, leaving behind brown bits. Add remaining oil and mushrooms to pan. Cook until mushrooms begin to brown, 6 to 8 minutes. Add shallots; cook 3 minutes. Stir in garlic and rosemary; cook 1 minute more. Add wine, increase heat to medium-high, and cook until wine is nearly evaporated. Season with ¾ teaspoon salt and pepper. Return sausage to pan and stir to combine.
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Heat oven to 375 degrees. Lightly oil a 13-by-9-inch baking dish.
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Melt butter in a large saucepan over medium heat. Stir in flour; cook until foaming but not colored, about 2 minutes. Whisk in milk; bring to a simmer. Cook until thickened, about 5 minutes. Season with remaining ¼ teaspoon salt.
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Cook rigatoni according to package directions, undercooking by 3 minutes. Drain; return to pot. Add sausage mixture to pasta; toss well. Add sauce and crushed tomatoes; stir to combine. Stir in fontina and 2 tablespoons Parmigiano Reggiano.
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Transfer pasta mixture to baking dish. Sprinkle remaining Parmigiano Reggiano over top; cover with foil. Bake 20 minutes. Remove foil and bake 10 minutes more. Let stand 5 minutes before serving. Serves 8.
— Recipe by Larraine Perri