Preheat your oven to 325 degrees. Peel carrots and cut into 2 inch chunks. Peel potatoes and cut into large chunks. Season the chuck roast with the kosher salt, pepper, and thyme.
Add the vegetable oil the dutch oven and heat. When it ripples and is hot, add the roast and brown deeply for 4–5 minutes on each side (or if you can, brown in your slow cooker).
Add remaining ingredients and do one of the following: 1) Bring just to a simmer on the stove top over medium high heat. Once the broth is simmering, cover and place in the over and bake for 2 hours. OR 2) cover and place in the over and cook for 3 – 3 ½ hours.