01 - Combine beef tips with salt, pepper, and dried thyme, coating evenly.
02 - Arrange seasoned beef in the slow cooker. Top with chopped onion and minced garlic.
03 - Whisk together beef broth, Worcestershire sauce, tomato paste, and flour in a medium bowl until completely smooth.
04 - Pour liquid mixture over beef and vegetables. Stir gently to incorporate. Cover and cook on low for 6-7 hours or high for 3-4 hours until beef is fork-tender and gravy has thickened.
05 - Sample the gravy and adjust salt and pepper as desired.
06 - Spoon beef tips and gravy over mashed potatoes, noodles, or rice. Sprinkle with fresh parsley if using.