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