Wash chicken. Pat dry with paper towels. Season with salt, white pepper, and paprika. Using a large frying pan, brown chicken in 1 tablespoon butter. Place mushrooms and drained artichoke hearts in bottom of crockpot. Sprinkle with quick-cooking tapioca. Add the browned chicken pieces. Pour in broth and sherry. Add tarragon. Cover crockpot and turn to Low heat setting. Cook for 7-8 hours OR cook on High for 5 hours.