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1
Preheat oven to 400F.
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2
Butter two shallow 2-quart baking dishes (or equivalent).
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3
In a large pot of boiling salted water, cook pasta 3 minutes short of al dente (according to the al dente instructions listed on the package); drain pasta, and return to pot.
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4
In a large nonstick skillet, heat oil over medium-high.
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5
Brown Italian sausage until cooked all the way through.
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6
Remove from heat to cool.
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7
In a 5-quart Dutch oven or heavy pot, melt butter over medium.
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8
Once melted add flour and garlic; cook, whisking, 1 minute.
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9
While whisking, gradually add milk; bring to a simmer, add in the freshly grated nutmeg, whisking frequently until thickened.
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10
Add mushrooms, sausage and tomatoes; cook 1 minute.
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11
Off heat, gradually stir in provolone and 1/2 cup Parmesan.
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12
Add pasta to pot; season with salt and pepper.
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13
Divide pasta mixture between baking dishes; sprinkle each with the remaining cup Parmesan.
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14
Bake, uncovered, until top is golden and bubbling, about 20-25 minutes.
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15
Let stand 5 minutes before serving.
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16
For Freezing: Prepare to the point where you sprinkle the top with Parmesan and then let pasta cool.
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17
Cover tightly with foil, and freeze up to 3 months.
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18
Reheating Frozen Pasta: Preheat oven to 400 degrees F, and bake (still covered in foil) on a rimmed baking sheet until center is hot, about 1 1/2 hours.
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19
Remove foil; bake until golden, about 15 minutes more.