Broccoli And Chicken Casserole

• 475 ml skim milk
• 280 gr chicken (chopped cooked)
• 240 gr rice (cooked)
• 60 gr onion (chopped)
• 50 gr celery (chopped)
• 28 gr butter
• 1 gr pepper
• 1 package fat cream of mushroom soup (reduced undiluted)
• 1 package fat cream of chicken soup (reduced undiluted)