Broccoli Cheese Soup

This is one of my husband's favorite soups. We half the recipe because it is only the 2 of us eating, and we still have enough left-over for the next day. With all the cheese and butter, it may not be the healthiest soup, but it's got some vegetables in it. :)

In a large saucepan, dissolve 12 chicken boullion cubes in 3 qts water.
Add: 1 onion, finely chopped
1 cup celery, chopped
2 10 oz pkg frozen broccoli or cooked fresh
Cook the above ingredients until tender.
In a separate bowl, melt 2 1/2 cubes butter or margarine. Add 1 1/4 cups flour to the melted butter and blend until it is a smooth paste. Add to the vegetable mixture and stir.
Add 1 16 oz jar of cheese whiz and mix well.
Cook until smooth and thick.