Spanish Chicken

Preheat oven to 425 degrees and distribute racks evenly Chop onions into medium - large pieces Cut potatoes into medium-sized cubes Coat bottom of 2 shallow backing pans with oil Rub chicken with oil and season with salt, pepper, and oregano Sear chicken in saute pan on high heat to crisp skin Move chicken to baking pans Evenly distribute onion and potatoes between the pans with the chicken Season onions and potatoes with oregano, salt, pepper, and orange zest Place chicken in oven After 30 minutes, add chorizo and swap top tray with bottom tray, and cook an additional 30 minutes or until chicken is done