Brown the ground beef, and Italian sausage over medium heat. Drain fat.
Toss in the onions, and cook until translucent.
Add the minced garlic along with the pasta sauce, and stir.
Pour in the pasta sauce, and stir.
Sprinkle in Italian seasoning, and salt & pepper.
Stir the ingredients, and turn the heat down to low.
Let cook for 10 minutes.
While the sauce is simmering, cook the spaghetti pasta until al dente'.
Drain the pasta, then set to the side.
Grab a 9x13 bake dish, and add a some of the meat sauce at the bottom.
Next add some of the spaghetti pasta, then the sauce, followed by the cheese.
Repeat the layering process.
Leave the spaghetti uncovered.
Bake on 350 F for 30 - 40 minutes.
Serve, and enjoy!