01 - Heat olive oil in a large skillet or Dutch oven over medium heat. Add onion, carrot, celery, and bell pepper. Cook for 5 to 7 minutes until softened.
02 - Incorporate minced garlic and cook for 1 minute until fragrant.
03 - Add ground beef, breaking it apart with a spoon. Cook until browned and no longer pink, approximately 6 to 8 minutes. Drain excess fat if necessary.
04 - Stir in tomato paste, crushed tomatoes, oregano, basil, thyme, crushed red pepper flakes, salt, and black pepper until evenly mixed.
05 - Pour in red wine and broth. Add bay leaf. Bring to a simmer, partially cover, and cook on low heat for 25 to 30 minutes, stirring occasionally.
06 - While sauce simmers, heat a large skillet over medium-high heat. Add zucchini noodles and sauté for 2 to 4 minutes until tender but still firm.
07 - Remove bay leaf from sauce. Adjust seasoning to taste.
08 - Divide zucchini noodles among plates. Top with beef sauce. Garnish with grated Parmesan and fresh basil if desired.