Bring a large pot of lightly salted water to a boil. Cook pasta in boiling water for 8 to 10 minutes, or until al dente; drain.

Heat olive oil in a large, heavy skillet over medium heat. Cook onion in oil until tender. Stir in rosemary and garlic. Transfer to a small bowl.

Place ground beef and sausage in the skillet. Cook over medium-high heat until evenly brown. Stir in the onion mixture and the spaghetti sauce. Season with salt. Reduce heat to low, and simmer for 10 minutes.

Preheat oven to 350°F (175°C). Grease a 9x13 inch baking dish. In the prepared dish, layer 1/2 of the cooked pasta, provolone cheese, sour cream, cottage cheese, and a little less than 1/2 of the meat mixture. Then layer the rest of the pasta, mozzarella cheese, remaining meat mixture, and Parmesan cheese.