Brown meat, add onion, and cook until tender. Add tomato paste, water, salt, and pepper. Cook wide noodles. Heat milk, cream cheese, and blend well. Stir in 1/4 cup Parmesan cheese, garlic salt, green pepper, and cooked noodles. Layer in a 9x13-inch pan. Put mozzarella cheese in middle and 1/4 cup Parmesan cheese on top. Bake at 350 degrees for 20 minutes.