Clean the mushrooms by wiping them with a dry paper towel. Don't wash them! Separate the stems, trim off any bad parts, and coarsely chop the stems. Slice the mushroom caps 1/4-inch thick and, if there are big, cut them into bite-sized pieces. Set aside.

To make the stock, heat the olive oil in a large pot. Add the chopped mushroom stems, onion, thyme, salt, and pepper and cook over medium-low heat for 10 to 15 minutes, until soft.

Add 6 cups water, bring to a boil, reduce the heat, and simmer uncovered for 30 minutes. Strain, reserving the liquid. You should have about 4 1/2 cups of stock. If not, add some water.

Meanwhile, in another large pot, heat all of the butter and add the sliced mushroom caps and cook for 10 minutes, or until they are browned and tender. Add the flour and cook for 1 minute. Add the white wine and stir for another minute, scraping the bottom of the pot. Add the mushroom stock and bring to a boil. Reduce the heat and simmer for 15 minutes. Add the half-and-half, cream, and parsley, season with salt and pepper, to taste, and heat through but do not boil. Serve hot.