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Cook pasta in boiling salted water according to package directions until barely al dente; drain.
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Remove casings from sausages and break into ½ inch pieces. Heat oil in large skillet over medium-high heat. Add sausage and onion; sauté 10-12 minutes. Add mushrooms, garlic, basil, thyme, 1 tablespoon parsley, and salt. Cook until liquid from mushrooms has evaporated (9-11 minutes). Add pasta sauce and cream. Bring to a simmer; remove from heat and add pasta.
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Transfer to 4 quart baking dish. (May be refrigerated several hours or overnight)
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To Bake: Bake covered, in a 350 degrees oven, 15 minutes (30 minutes if refrigerated); remove cover and stir. Combine cheeses and remaining parsley; sprinkle evenly over pasta. Continue baking, uncovered, until bubbly in center and cheese is melted (about 15 minutes).