Broccoli Basil Soup

4 Tbsp butter
1 chopped onion
3/4 Cup chopped celery
1 (16oz) package frozen broccoli florets
3 1/2 Cups chicken broth
1 tsp salt
1/2 tsp dried basil
1/4 tsp pepper
2 cans undiluted evaporated milk
2 Cups instant mashed potato flakes

Melt butter. Sauté onion and celery. Add broccoli and broth, salt, basil and pepper. Bring to boil. Reduce heat and cover. Simmer 6 minutes or until broccoli is tender. Stir in milk and potato flakes. Warm to serving temperature, do not boil. Serves 6.