Brown ground beef in a large nonstick skillet, breaking it apart as it cooks. When it is about halfway cooked, add the onion.Drain off excess grease.
Add tomato paste, diced tomatoes, Rotel tomatoes and Italian seasoning to ground beef. Season with salt and pepper.
Combine spaghetti sauce and water.
In a medium bowl, mix together cream cheese, cottage cheese, and sour cream until smooth. Stir in green onions and garlic powder.
Pour half of spaghetti sauce in the bottom of a 6-quart crock pot.
Add half the pasta to the crock pot.
Top with half the meat sauce.
Spread all of the cream cheese mixture over the meat sauce.
Add remaining pasta and top it with remaining meat sauce and then the remaining spaghetti sauce.
Cover and cook on LOW for 3 hours.
Stir well. Sprinkle cheese on top and cover for another 10 minutes.