In a large pot of boiling salted water, cook spaghetti according to package instructions. Drain.
Step two
In a large bowl, combine beef with bread crumbs, parsley, Parmesan, egg, garlic, 1 teaspoon salt, and red pepper flakes. Mix until just combined then form into 16 balls.
Step three
In a large pot over medium heat, heat oil. Add meatballs and cook, turning occasionally, until browned on all sides, about 10 minutes. Transfer meatballs to a plate.
Step four
Add onion to pot and cook until soft, 5 minutes. Add crushed tomatoes and bay leaf. Season with salt and pepper and bring to a simmer. Return meatballs to pot and cover. Simmer until sauce has thickened, 8 to 10 minutes.
Step five
Serve pasta with a healthy scoop of meatballs and sauce. Top with Parmesan before serving.
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