Shake flour in Reynolds® Oven Bag; place in 13x9x2-inch or larger baking pan at least 2 inches deep.
Add water and soup mix to oven bag. Squeeze bag to blend in flour. Add roast to bag. Turn bag to coat roast with sauce. Place potatoes, onion and carrots in bag around roast.
Close oven bag with nylon tie; cut six 1/2-inch slits in top. Tuck ends of bag in pan.
Bake 2 1/2 to 3 hours or until roast is tender. Sprinkle with parsley before serving, if desired.
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