Chef John's Creamy Mushroom Soup

Details

Ingredients

• ¼ cup unsalted butter
• 2 pounds sliced fresh mushrooms
• 1 pinch salt
• 1 yellow onion, diced
• 1 ½ tablespoons all-purpose flour
• 6 sprigs fresh thyme
• 2 cloves garlic, peeled
• 4 cups chicken broth
• 1 cup water
• 1 cup heavy whipping cream
• 1 pinch salt and freshly ground black pepper to taste
• 1 teaspoon fresh thyme leaves for garnish, or to taste