In a large Dutch oven or pot, heat over medium heat and add ground beef and diced onion. Cook for 5-10 minutes until beef is browned; drain excess grease.
Add minced garlic and sauté for 1 minute until fragrant.
Stir in crushed tomatoes, chicken broth, and heavy cream. Add salt, black pepper, oregano, basil, granulated sugar, and red pepper flakes if using.
Bring the mixture to a boil.
Add spaghetti noodles, ensuring they are submerged. Reduce heat to a gentle simmer.
Cover and simmer for 15-20 minutes, stirring every 5 minutes until noodles are al dente.
Once cooked, serve garnished with fresh parsley and grated Parmesan cheese.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.