Add the ground beef and onion to a large pot, covering the mixture with beef broth.
Gently break apart the meat without browning it. Cincinnati chili is traditionally boiled, resulting in a soft, saucy texture.
Stir in tomato sauce, garlic, chili powder, cocoa powder, cinnamon, allspice, cloves, paprika, sugar, salt, and pepper.
Bring to a simmer, then reduce heat to low.
Cook for 60–90 minutes, stirring occasionally until the sauce thickens and flavors deepen.
Taste and adjust seasoning as needed.
Serve over cooked spaghetti, then top with shredded cheddar.
For traditional “ways,” add onions and beans depending on whether you want 3-Way, 4-Way, or 5-Way chili.