Heat olive oil in a large skillet over medium-high heat. Season the sirloin tip roast with salt, pepper, garlic powder, onion powder, thyme, and rosemary. Sear the roast in the skillet for about 3-4 minutes on each side until browned.
Place the sliced onion, chopped carrots, and diced potatoes in the bottom of the crock pot.
Transfer the seared roast to the crock pot on top of the vegetables.
Pour the beef broth over the roast and vegetables.
Cover and cook on low for 8-10 hours or on high for 4-5 hours, until the roast is tender and easily shredded with a fork.
Once cooked, remove the roast and let it rest for 10 minutes before slicing. Serve with the vegetables and broth from the crock pot.