Combine ground beef, Italian sausage, diced onion and minced garlic in a large skillet. Cook over medium heat until meats are browned. Drain fat. While meats are browning, cook spaghetti to al dente and drain in colander.

When meats are browned, mix in marinara sauce and Italian seasoning.

In a medium bowl, combine the cottage cheese, shredded parmesan, and egg. 

In a large bowl, combine hot spaghetti and cubed cream cheese. Mix with spatula until cream cheese has melted and coated the spaghetti.

Assemble in a 9 x 13 casserole as follows: On bottom of casserole, layer half of the meat sauce. Place half of the spaghetti evenly over the top. Put all of the cottage cheese mixture layered over the top of the spaghetti. Place the rest of the spaghetti on top of the cottage cheese mixture. Cover spaghetti with remaining meat sauce. Sprinkle Italian style shredded cheese over all. 

Cover with foil and bake 20 minutes. Remove foil and sprinkle with the last ½ cup of fresh parmesan. Return to oven and bake, uncovered, for 30 minutes, or until cheese is melted and beginning to turn golden.

Remove from oven and let stand 10 minutes. Cut into squares and serve.