Baked Chicken with Rice

Why I Love This Recipe
My mother made this often when I was a kid. Right now, I'm going through her recipes, remembering everything she used to make. She keeps her recipes on loose paper, in an old binder, kept in a plastic bag. I think it's her way of making sure she doesn't lose any of the small bits of paper she's got stuffed in there. :D It's tricky, interpreting her handwriting...
Ingredients You'll Need
1 Onion, cut up in big chunks
1 Whole Chicken, in pieces (including innards)
2/3rds of a stick of butter, cut up into cubes
Olive Oil
1 1/2 cups of washed rice (white, but it might be interesting with brown)
2 cups of water ( this should be a little less then twice the amount of rice, so make it a generous 2 cups.)
Garlic, if desired
Salt and Pepper
Largish oven pot, with lid.
Directions
Preheat oven to 450 degrees. In an oven pot, put 1 1/2 cups of washed rice. On top of the rice, add the chicken pieces, placed evenly throughout the pot. Use the neck, kidneys, etc. because it adds flavor. Place the butter throughout the pot, making sure it's all evenly spaced. Dribble some oil over, and then add the water. Add salt and pepper, if you like. Put the lid on and place in the oven for 1 hour.
When you remove the pot from the oven, take the lid off so the excess water won't sag the rice.