Panera Broccoli Cheese Soup

This is my favorite broccoli soup! I found it on recipezaar and finally got around to trying it--YUM! I served it with some warm wheat bread.
John's Rating: 9

5 tablespoons melted butter
1 medium chopped onion
1/4 cup flour
2 cups milk
2 cups chicken stock
1 large head of fresh broccoli
2 carrots, julienned
1/4 teaspoon nutmeg
8 ounces grated sharp cheddar cheese
salt and pepper

Sauté onion in butter. Add flour using a whisk over medium heat for 3-5 minutes. Stir constantly and add the milk. Add the chicken stock. Blend in VitaMix to puree onion. Simmer for 10 minutes.

Add the broccoli and carrots. Cook over low heat 20-25 minutes. Add salt and pepper. Can be puréed in a blender but I don't. Return to heat and add cheese. Stir in nutmeg.