Cook spaghetti noodles in a large pot of salted water, according to package instructions, until al dente. Drain and set aside.
Preheat oven to 350F.
Meanwhile, in a large skillet, combine Italian sausage, ground beef, and onion. Cook until meats are no longer pink and onion is tender; drain off any excess oil.
Add marinara sauce to the skillet and stir to combine; set aside.
In a medium bowl, beat together ricotta, cream cheese, and egg.
Spoon 1 cup of the meat sauce into the bottom of a 9×13 baking dish. Layer half of the spaghetti noodles, half of the meat mixture, half of the ricotta mixture, and half of the mozzarella and parmesan cheeses. Repeat layering for the remaining half of the ingredients.
Bake for 30 minutes until cheese is fully melted and the sauce is bubbling up around the sides of the dish. If desired, broil for 2-3 minutes to brown the top of the cheese.
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