Start by preheating your oven to 325°F.
Sprinkle your beef chuck roast generously with salt and black pepper.
Place the roast in the refrigerator while you prepare the vegetables.
In a large oven-safe pot, heat the olive oil over medium-high heat.
Add the diced onions and minced garlic, cooking until they are soft and fragrant.
Remove the vegetables from the pot and set them aside.
Increase the heat under the pot to high.
Brown the beef roast in the same pot on all sides for about 2-3 minutes per side.
This will seal in the flavors.
Return the cooked onions and garlic to the pot with the beef.
Cover the pot with a lid or foil and place it in the preheated oven.
Allow the roast to cook for about 3 hours, until tender.
Once cooked, carefully remove the pot from the oven.
Allow the meat to rest for 10 minutes before slicing or serving.