Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add onion, garlic, and beef to pan; cook 5 minutes or until beef is browned, stirring occasionally. Combine beef mixture, tomato, and next 6 ingredients (through broth) in an electric slow cooker. Cover and cook on HIGH for 3 1/2 hours or until beef is tender. Uncover; cook 30 minutes or until slightly thickened. Stir in salt.