Turn oven to 325F and grease large casserole dish.
Pour in first 5 ingredients and stir well. It will look like a lot of milk but it isn't too much.
If you want raisins and cinnamon stir it in now. I never put them in as my family prefers it without.
Dot the top of the ingredients with chunks of butter.
Bake for 2-3 hours. Stir every 15 minutes for the first hour and then just let it cook. Check it at 2 hours and if it is getting dry add another cup of milk and stir. Taste test to be sure rice is cooked.
It will get a nice brown skin on top. You can remove it but I like to stir it in as I serve it. It is very flavourful.