Spanish Chicken

This is my absolute favorite go-to chicken dinner. It's quick and easy to make and looks fabulous when you bring it to the table. What would I do without Nigella? She's the best!

4 Tbsp olive oil
8 chicken thighs (with skin)
6 full-sized chorizo, cut into small chunks
3 large potatoes, cut into 1-1/2 inch cubes
2 red onions, peeled, and chopped roughly
1 to 2 tsp oregano

Preheat the oven to 425 degrees F.
Sprinkle the bottom of two large Pyrex casserole dishes with some olive oil. Put four chicken thighs into each casserole and drizzle with olive oil. Divide the cubed potatoes, chopped onion and chopped chorizo between the dishes. Season with sea salt, pepper and oregano. 
Bake for 30 minutes and then switch the casseroles so that the bottom one is now on the top rack. Spoon the juices over the chicken and cook for another 30 minutes. 
This dish is lovely served with a green salad or a nice big bowl of green beans.