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1. In a large skillet, heat the olive oil over medium heat. Add the onion and garlic and sauté until the onion is translucent.
2. Add the ground beef to the skillet and cook until browned, breaking it up with a spoon as it cooks.
3. Transfer the cooked beef mixture to the slow cooker.
4. Add the crushed tomatoes, tomato paste, oregano, basil, salt, pepper, beef broth, Worcestershire sauce, and bay leaf to the slow cooker. Stir to combine.
5. Cover and cook on low for 6-8 hours or on high for 3-4 hours.
6. About 20 minutes before serving, cook the spaghetti according to package instructions.
7. Discard the bay leaf from the sauce. Serve the Bolognese sauce over the cooked spaghetti and top with freshly grated Parmesan cheese.
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