Creamy Potato Leek Soup

6 large boiling potatoes, peeled and quartered 8 leeks, green trimmed off, washed, and chopped coarse 3 stalks celery, chopped coarse 1 medium yellow onion, peeled and quartered 1 bay leaf 2 quarts chicken stock 1/2 cup all-purpose flour 1 stick butter, room temperature 1 cup heavy cream 1 1/2 tsp fresh thyme, finely chopped […]