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Heat oven to 350 degrees. Place roast in casserole with ... onion soup over meat. Bake covered 2 to 2 1/2 hours, add vegetables. Cover and bake another hour.eat oven to 350 degrees. Place roast in casserole with ... onion soup over meat. Bake covered 2 to 2 1/2 hours, add vegetables. Cover and bake another hour.
How long do you cook a 3 lb chicken? At 350 degrees F, you should roast a whole (thawed)chicken for 20  minutes per pound, plus 15 more minutes. If stuffed, cook the  chicken for an additional 15 minutes. So yo â¦ u would cook your 3 lb.  chicken at 350 degrees F for 1 hour and 15 minutes.t 350oF, you should roast a whole (thawed)chicken for  20 minutes per pound, plus 15 more minutes. If stuffed, cook the  chicken for an additional 15 minutes.