Preheat your oven to 325°F (165°C).
Trim any excessive fat from the chuck steak and cut into 1-inch cubes.
Season the beef cubes evenly with the sea salt and black pepper.
Heat the olive oil in an oven-safe Dutch oven or heavy-bottomed pot over medium-high heat.
Sear the beef in batches until a deep brown crust forms on all sides, then remove the meat and set aside.
In the same pot, add the diced onion, sliced carrots, and celery, sautéing for 5-7 minutes until the onions are translucent.
Add the minced garlic and dried thyme, stirring for 60 seconds until fragrant.
Return the seared beef and any accumulated juices back into the pot.
Pour in the beef broth and use a wooden spoon to scrape up the flavorful browned bits from the bottom of the pan.
Cover the pot with a tight-fitting lid and transfer to the oven.
Bake for 90 minutes, or until the beef is tender enough to break apart with a fork.