Mix flour mixture together and coat chunks of stew meat.
Heat oil in a frying pan and brown the outside layer of the meat. Remove from heat and set aside.
Cut parsnips, peel and cut carrots, remove seeds and stem from poblanos, and peel and cut sweet potatoes.
Add meat, parsnips, carrots, poblanos, and sweet potatoes to slow cooker. Add 4 cups of broth and 2 cups of water.
Cover and cook on low for 6-8 hours or until meat is tender.