Place the sliced onion and minced garlic in the bottom of the slow cooker.
Season the roast on all sides with salt, pepper, and Italian seasoning. Set the pot roast on top of the onions.
Place the carrots, celery, and baby potatoes around the meat.
Pour the beef broth over everything. Cover with the lid and cook on LOW for 8 hours or on HIGH for 4 to 5 hours, until the meat is tender and easily pulls apart with a fork.
Once done, remove the roast, slice or shred it, and serve with the vegetables and cooking juices.
Notes
Thicken the sauce:For a thicker gravy, mix 1 tablespoon cornstarch with 2 tablespoons cold water and stir it into the cooking liquid during the last 20 minutes.Sear meat for extra flavor:If you have a few extra minutes, quickly brown the roast in a hot skillet before adding it to the slow cooker. This adds a deeper, richer flavor.