Prep Time: 5
Cook Time: 25
Serves: Serves: 4
Melt butter in a large saucepan over medium heat. Add onion; cook 5 minutes or until tender, stirring occasionally. Add mushrooms; continue to cook 5 minutes or until tender, stirring occasionally. Sprinkle flour over mushroom mixture; cook and stir 1 minute. Add broth, milk, salt and pepper; bring to a boil over high heat. Reduce heat; simmer 10 minutes, stirring occasionally.
Turn off heat. Stir in 1-1/2 cups cheese until melted. Ladle into bowls; top with remaining 1/4 cup cheese and garnish with thyme and croutons if desired.