Preheat oven to 425 degrees toss together onion, oil 1/4 teaspoon and 1/8 teaspoon pepper on a large rimmed baking sheet. Loosen skin from chicken thigh and leg by inserting fingers, gently pushing between skin and mea. Rub remaining 1/4 teaspoon salt and 1/8 teaspoon pepper under skin. Place chicken on top of onions in pan, and squeeze lemon juice over al.
Bake for 50 minutes to 1 hour or until a meat thermometer inserted into the thickest part of the thigh registers 175 degrees. Remove and discard skin from chicken before serving
*Recipe prepared by registered dietitian of St Vincent's Health System