In a skillet, brown chicken lightly in the butter. Transfer the chicken to a baking dish. Add mushrooms to skillet and saute for a few minutes, until lightly browned; remove and spoon over the chicken pieces.
Place drained artichoke hearts on the chicken pieces. Add flour to the remaining butter and stir to blend. Add broth and cook until thickened; pour over chicken. Bake the casserole at 350 degrees for about 45 minutes.
