Potluck Chicken Casserole

• 2 garlic (cloves minced)
• 2 pimientos (diced drained)
• 550 gr cubed chicken (cooked)
• 350 gr long rice (cooked grain)
• 300 ml milk
• 200 gr peas (frozen thawed)
• 180 ml mayonnaise
• 120 gr coarsely cornflakes (crushed)
• 100 gr celery (chopped)
• 55 gr butter