Melt 1/2 butter in large heavy skillet and saute the chops for 10 minutes. Transfer to a heated plate and keep warm. Melt remaining butter in skillet and saute onions, mushrooms and parsley until golden. Salt and pepper.
Turn off heat and prepare foil packets. Cut 8 pieces of foil, each 10 x 14 inches. On each piece, place in center one piece of ham; top with a venison chop. Add a generous tablespoon mushroom mixture and 1 tablespoon sour cream. Seal. Place in 350 degree oven for 20 minutes. Serve in foil.