Prepare vegetables: dice potatoes, slice carrots, chop celery and onion, and mince garlic.
Season chicken with paprika, salt, and pepper.
In the slow cooker, layer potatoes, carrots, celery, onion, and garlic. Place chicken on top.
Add chicken broth, tomato paste, thyme, and bay leaves. Stir gently.
Cover and cook on LOW for 6–7 hours or HIGH for 3–4 hours until chicken is tender.
Remove chicken, shred or cube it, then return it to the stew.
Stir in a flour slurry (flour + water) and cook for 20 minutes more until the stew thickens.
Garnish with fresh parsley and serve hot with bread or biscuits.