01 -
Add diced onion, bell pepper, and celery to a 5-6 quart slow cooker, spreading evenly on the bottom.
02 -
Place the beef chuck roast on top of the layered vegetables.
03 -
For enhanced flavor and color, heat a skillet with a small amount of oil over medium-high heat. Brown the roast for 2 minutes on each side before adding to the slow cooker.
04 -
In a bowl, whisk together minced garlic, tomato sauce, barbecue sauce, Worcestershire sauce, beef bouillon cubes, dried thyme, and water until well combined.
05 -
Pour the sauce mixture evenly over the roast and vegetables. Cover slow cooker and cook on low for 6 to 8 hours without removing the lid during cooking.
06 -
Garnish with chopped parsley if desired. Serve the tender pot roast over mashed potatoes.