01 -
Add diced onion, diced bell pepper, and diced celery to a 5 to 6 quart slow cooker.
02 -
Place the 3-pound beef chuck roast on top of the vegetables in the slow cooker.
03 -
If desired, heat a large skillet with a small amount of oil over medium-high heat. Brown the chuck roast for 2 minutes on each side to enhance flavor and color before placing it in the slow cooker.
04 -
In a bowl, whisk together minced garlic, tomato sauce, barbecue sauce, Worcestershire sauce, crumbled beef bouillon cubes, dried thyme, and water until combined.
05 -
Pour the sauce mixture evenly over the roast and vegetables in the slow cooker.
06 -
Cover and cook on low for 6 to 8 hours without removing the lid to maintain temperature and tenderness.
07 -
Once cooked, optionally garnish with chopped parsley and serve over mashed potatoes or preferred sides.