Cheesy Broccoli

• 1,400 gr casserole combine soup
• 180 gr herb-seasoned stuffing mix
• 130 gr carrots (shredded)
• 120 ml vermont sour cream
• 110 gr vermont sharp cheddar cheese
• 110 gr broccoli (frozen)
• 30 gr onion (chopped)
• 9 gr butter
• 3 gr all purpose flour
• 1 gr salt