Broccoli Ham Hot Dish

• 1 onion (chopped)
• 1 cheddar (shredded)
• 700 ml milk
• 650 gr fully ham (cooked)
• 240 gr rice (cooked)
• 220 gr bread crumbs (fresh)
• 210 gr pkgs broccoli (frozen cut)
• 85 gr butter
• 24 gr flour
• 3 gr salt