Spanish style baked chicken with chorizo and potatoes. 3 tablespoons regular olive oil 12 chicken thighs (bone in, with skin) 750 grams chorizo sausages, whole if baby ones, or cut into 4-cm chunks if regular-sized 1 kilogram baby potatoes, half the larger ones 2 red onions, peeled and roughly chopped 2 teaspoons dried oregano grated zest of one orange