Trim any excess fat from the beef chuck roast and cut into small, half-inch cubes.
Heat the olive oil in a heavy-bottomed pot over medium heat.
Add the beef cubes to the pot and sear until browned on all sides to lock in flavor.
Stir in the finely chopped onion, garlic, diced carrots, and celery, sautéing for about 4 minutes until the vegetables begin to soften.
Add the cubed Yukon gold potatoes, dried thyme, sea salt, and black pepper to the pot.
Pour in the beef bone broth and bring the mixture to a gentle boil.
Reduce the heat to low, cover with a tight-fitting lid, and simmer for 45 to 60 minutes until the beef is very tender and the vegetables are soft.
For babies, mash the vegetables with a fork and finely shred the beef before serving; for adults, serve as a chunky, hearty stew.