Wash and prepare vegetables: dice onion, finely chop garlic, peel and chop carrots, seed and finely chop bell pepper, chop zucchini, and roughly chop mushrooms.
Heat oil in a large pan over medium high heat. Add ground beef, onion and garlic. Cook until browned, making sure to crumble the beef as it cooks. Drain excess fat.
Place ground beef mixture into slow cooker.
Mix in remaining vegetables, crushed tomatoes, broth, spices and salt. Stir to combine.
Cover and cook on LOW for 8-10 hours. Remove bay leaf before serving
