In a large bowl place the sweet potatoes and white potatoes, ½ cup olive oil to 2 lemon juice, ½-1 tablespoon oregano, pepper and ½ teaspoon salt. Mix well so that all the potatoes are coated with the oil.
Pour the potatoes in a pan, so that potatoes are all in one layer. Place in the oven.
Go on to prepare the chicken. Dry the chicken with paper towels. Rub with salt, than pepper than oregano both outside and under the skin.
Place chicken between potatoes.
Add about ¼ cup hot water in one corner of the pan and then tilt until the water has spread.
Roast for about 40 minutes until chicken has been roasted to a temperate of 165 F (75 C) and potatoes are soft