Cheesy Potato Chowder

This is really good and everyone I have made it for has asked for the recipe. I also like to add broccoli and/or cauliflower if I have them.

3/4 c chopped onion
3/4 c sliced carrots
3/4 c diced celery
2 t basil
1 t parsley
3 cups chicken broth
4 cups potatoes diced
1/4 c flour
8 oz shredded or cubes cheese
1 1/2 cups milk
3/4 t salt
1/2 t pepper
1/4 c sour cream

Saute onion, carrots, celery, basil and parsley in about 1 T. butter until veggies are tender. (about 10 min). Add broth and potatoes bring to a boil and simmer 10-12 min or until potatoes are tender. Mix flour in to milk separately. When well mixed pour into soup add salt and pepper and let thicken. Turn to low and add cheese keep stirring until melted. Remove from heat and stir in sour cream right before serving.