Instructions
step 1 In a skillet over medium heat, cook the ground beef with diced onion until browned, then drain excess fat./nstep 2 Add minced garlic and cook for another minute until fragrant./nstep 3 Transfer the beef mixture to the slow cooker./nstep 4 Pour in marinara sauce, crushed tomatoes, and tomato paste./nstep 5 Add Italian seasoning, salt, pepper, sugar, basil, and oregano, then stir to combine./nstep 6 Cover and cook on low for 6–8 hours or on high for 3–4 hours./nstep 7 Cook spaghetti according to package instructions just before serving./nstep 8 Serve the meat sauce over spaghetti and top with grated Parmesan cheese if desired.
Storage and Reheating Tips
Store leftover sauce in an airtight container in the refrigerator for up to 4 days or freeze for up to 2 months. Reheat on the stovetop or in the microwave until warmed through. Add a splash of water if needed to loosen the sauce.
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