Spread the onion slices on the bottom of the cooker. Sprinkle the roast with flour to coat all sides. Sear roast on all sides with a little olive oil, salt and pepper. Place in slow cooker on top on onions. whisk together beef gravy mix, ranch dressing mix, Italian dressing mix and water in a bowl. Pour over meat. Toss in some carrots and potatoes if desired. Cover and cook on high 6-8 hours or until roast is tender.
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