red bliss potatoes with rosemary

Easy potato recipe and tasty too. 3 portion, 450 degrees 1/2 hr.
1 lb. potato, 6 oz. onion, 1 tsp. fresh rosemary, total of 1 tsp. sea salt and 1/4 tsp. black pepper to be shared with the onion and potato, 2 T. olive oil for roasting and 1 T. for onions with rosemary.