Cook spaghetti according to package directions, drain.
3.
In large bowl, stir together sour cream, ricotta, half-and-half, mozzarella, oregano, basil, pepper, garlic, salt, and half the Parmesan cheese. Add spaghetti and toss until well coated.
4.
Pour spaghetti mixture into 9x13 pan lightly sprayed with cooking spray. Top spaghetti with remaining Parmesan cheese.
5.
Cover dish aluminum foil and bake 30 minutes.
6.
While pasta is baking, prepare meat sauce. Brown Italian sausage in skillet. Drain and return to skillet. Add spaghetti sauce and simmer.
7.
Remove pasta from oven. Cut into squares and top with meat sauce.
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