Whisk together flour, paprika, salt, pepper and thyme. Dredge the chicken pieces in the flour mixture and shake off excess. Reserve any excess flour. Add 3 tablespoons of the butter to skillet and saute chicken over medium heat until browned.
Saute onion in the remaining 2 tablespoons of butter over medium heat for a few minutes, or until tender. Stir in the reserved flour from the dredging, add chicken broth and stir until combined. Cook over medium heat, as it begins to thicken add cream and continue cooking until smooth and thickened. Add lemon juice and blend well.
Place browned chicken pieces and cut potatoes into a casserole dish. Pour the sauce over the chicken and potatoes and cover. Bake, covered, at 325 F for 1.25 hours (75 minutes).