ham broccoli rice and cheese casserole

Ingredients

• 1 - onion, chopped
• 1 tablespoon olive oil, extra virgin
• 3 cups rice, cooked (instant)
• 2 cups ham, cooked & diced ( i use pre-packaged)
• 3 cups broccoli flortets, steamed ( i use frozen, steam in bag kind)
• 10 ounces corn
• 1/2 cup milk
• 20 ounces cream of mushroom soup
• 2 cups cheddar cheese, shredded
• 1/2 cup breadcrumbs
• 1/2 cup parmesan cheese
• 1/4 cup butter or margarine, melted
• 1 dash salt
• 1 dash pepper
• 1 dash garlic salt