Broccoli Chowder

1 10oz. pkg. frozen broccoli
1 medium onion, chopped
1 can Cream of Chicken soup
2 Tbsp. flour
1 1/3 c. milk
1 c. cheddar cheese
1/8 tsp. ground red pepper
Bring ½ c. water to boil. Add broccoli and onion. Cover and simmer 5 minutes. Do not drain. Stir in soup, flour, milk, cheese and pepper. Cook on low until flour is cooked and soup is thoroughly heated.