Flatten chicken to 14-inch thick In a shallow bowl lightly beat the egg Combine cracker crumbs and salt in another shallow bowl Dip chicken in egg then in crumbs Set aside In a large ovenproof skillet saute mushrooms in 1 tablespoon butter until tender Remove and set aside In same skillet melt remaining butter Add chicken cook over medium heat 3 to 4 minutes Top with ham mushrooms and cheese Broil until cheese is melted