Preheat oven to 325°F.
Place the chuck roast in a large Dutch oven or oven-safe pot with a lid.
Scatter the sliced onions and minced garlic around and over the roast.
In a medium bowl, whisk together the beef broth, red wine, French onion soup mix packets, Worcestershire sauce, thyme, and black pepper until the soup mix is dissolved.
Pour the liquid mixture over the roast and onions, ensuring the roast is about halfway submerged.
Cover tightly with the lid and bake for 3 hours, or until the meat is fork-tender and easily shreds.
Remove from oven, let rest for 10 minutes, then slice or shred the roast and serve with the onions and pan gravy.