Both Durkee and McCormick make a Swiss Steak seasoning mix. These mixes are in a dry powder form and may come with a cooking bag to help cook a tender steak.
Swiss steak is made by slow cooking beef bottom in a richly seasoned sauce. The sauce and the slow cooking process ensures that the meat remains moist and tender. The steak is served in the sauce.
Durkee manufactures a Swiss steak seasoning with sweet onions, parsley, garlic and other spices. McCormick produces a seasoning mix with onion, salt, black pepper, paprika, garlic, green bell pepper and tenderizer, according to Fooducate.