01 - Combine salt, pepper, and thyme. Coat beef cubes evenly with seasoning mixture.
02 - Place seasoned beef in slow cooker. Top with chopped onion and minced garlic.
03 - Whisk together beef broth, Worcestershire sauce, tomato paste, and flour or cornstarch in a medium bowl until smooth and well-combined.
04 - Pour gravy mixture over beef and vegetables. Stir gently to distribute evenly.
05 - Cover and cook on low setting for 6-7 hours or on high for 3-4 hours until beef is fork-tender and gravy has thickened.
06 - Taste the gravy and adjust salt or pepper as needed before serving.
07 - Spoon beef and gravy over mashed potatoes, noodles, or rice. Garnish with fresh parsley if desired.