Golden State Mushroom Soup

Ingredients

• 1/4 cup butter
• 454 g fresh mushrooms (sliced)
• 1 medium onion (chopped)
• 1/4 cup all-purpose flour
• 1/2 tsp salt
• 1/8 tsp black pepper
• 1 1/2 cups milk
• 1 435ml can chicken broth
• 1 tsp chicken bouillon granules
• 1 cup sour cream
• fresh parsley (minced, (optional))