In a large nonstick pan or soup pot, brown ground beef, onions, and garlic until ground beef is no longer pink.
To make in the crock-pot: add the cooked beef, broth, tomatoes, pasta sauce, zucchini, red bell pepper, Worcestershire sauce, and steak seasoning. Cover and cook in crockpot 6 hours on low heat or 3 hours on high heat.
Stir in cooked macaroni and spinach. Cover and continue to cook for 15 minutes until heated.
To make on the stovetop: add the cooked beef, broth, tomatoes, pasta sauce, zucchini, red bell pepper, Worcestershire sauce, and steak seasoning. Bring to a boil. Turn down to a simmer, cover, and simmer for 35 minutes. Stir in cooked pasta and spinach. Cover and heat for 5 minutes.