1/2 c. chopped onion
1/4 c. butter
1 lb. mushrooms, or more, sliced
1 c. chopped celery
1/2 c. chopped carrots
1 c. diced potatoes

Saute onions in butter. Add mushrooms and saute. Add vegetables and cook for 10-15 minutes with a lid. (You can add a little water.)

After vegetables are tender, add: 3 cups boiling water OR 3 cups chicken broth OR 3 cup chicken bouillon. Season to taste.

Bring all to boil. Reduce heat. Add 1 cup of half and half and 1/4 cup Parmesan cheese.