Heat the oil in a large skillet over medium heat. Add the steaks, a few at a time, and cook until lightly browned on each side. Place the browned steaks on top of the onions in the slow cooker. Pour 2 c. water over all. Cover; cook on Low for 8 hours or until meat is tender.
In a bowl, whisk together the 3 gravy mixes with remaining 1 c. water. Add to slow cooker; cover and cook on Low for 30 minutes longer.
Serve over mashed potatoes, rice or noodles. 6 servings
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