Season the roast with salt, pepper, thyme, and rosemary.
Heat a skillet over medium-high heat and sear the roast on all sides until browned.
Place chopped onions and garlic in the crock pot.
Add carrots and potatoes on top of the onions.
Transfer the seared roast to the crock pot.
Pour beef broth over the roast and vegetables.
Cover and cook on low for 8 hours.
Once cooked, shred the meat with two forks.
Serve with the vegetables and juices.