Preheat the oven to 350 degrees F (175 degrees C).
Combine ground beef, soup, chopped onion, rolled oats, eggs, steak sauce, ketchup, and mustard in a large bowl. Mix well.
Shape into a loaf, and pat into a loaf pan.
Bake in the preheated oven until no longer pink in the center, about 1 hour.
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