Cream of Wild Mushroom Soup

INGREDIENTS

• 5 ounces fresh shiitake mushrooms
• 5 ounces fresh portobello mushrooms
• 5 ounces fresh cremini (or porcini) mushrooms
• 1 tablespoon good olive oil
• 1/4 pound (1 stick) plus 1 tablespoon unsalted butter, divided
• 1 cup chopped yellow onion
• 1 carrot, chopped
• 1 sprig fresh thyme plus 1 teaspoon minced thyme leaves, divided
• Kosher salt
• Freshly ground black pepper
• 2 cups chopped leeks, white and light green parts (2 leeks)
• 1/4 cup all-purpose flour
• 1 cup dry white wine
• 1 cup half-and-half
• 1 cup heavy cream
• 1/2 cup minced fresh flat-leaf parsley