Steps

• Begin by boiling water in a large pot to cook the pasta. Once the water reaches a rolling boil, add a pinch of salt and the pasta. Stir occasionally to prevent sticking. Cook according to the package instructions until al dente. Drain and set aside.
• In a large skillet, heat olive oil over medium heat. Add the diced onion and minced garlic, sauté until onions are translucent and garlic is fragrant, about 2-3 minutes.
• Add the lean ground beef to the skillet with the aromatics. Break up the beef with a wooden spoon, cooking until browned and no longer pink. Drain excess fat, if necessary. Season with salt, pepper, and Italian seasoning to taste.
• Stir in chopped red bell pepper, diced tomatoes, and spinach to the beef mixture. Allow the vegetables to cook until tender and spinach is wilted, about 5 minutes.
• Add the cooked pasta to the skillet, tossing gently to combine with the beef and vegetable mixture. Incorporate grated Parmesan cheese, stirring until melted throughout.