In a 5 qt dutch oven, melt 4 tablespoon of butter over medium heat and add the cleaned mushrooms. Cook the water out of them, sprinkling with about ½ teaspoon kosher salt and pepper and stirring, letting them gain a little color for 5 minutes. Remove the mushrooms into a bowl and set them aside.
8 tablespoon salted butter, 8 ounces cremini mushrooms, 4 ounces oyster mushrooms, ½ tablespoon kosher salt, 1 teaspoon freshly ground black pepper
Melt the other 4 tablespoon of butter into the pot, then sauté the onions, carrots, and celery in the butter. Stir occasionally for 4-5 minutes, seasoning with 1 teaspoon of salt, we want to get a golden brown color on the onions' edges and have the celery and onions turn a little translucent.
1 medium yellow onion, 2 medium carrots, 2 celery ribs
Once the onions have golden brown edges, add the herbs and garlic. Stir them well and let them cook for two minutes, we don't want the garlic to burn.
4 garlic cloves, 1 teaspoon dried oregano, 1 teaspoon dried thyme
Stir in the flour, coating the veggies in the flour, and cook for a minute to get rid of the raw flour taste, stirring continuously.
¼ cup all purpose flour
Slowly splash in the chicken broth, stirring while adding so the flour doesn't clump up (it will thicken and seize at first but keep going).
7 cups low-sodium chicken broth
When all the chicken broth is in the pot, add those cooked mushrooms back into the pot and pour in the wild rice. Bring the pot to a boil over medium-high heat. Once at a boil, bring the heat down to medium, cover the pot with a lid, and simmer the soup for 45 minutes OR as the wild rice's package directs.
1 cup wild rice or wild rice blend
When the rice is done, it'll be chewy and tender, not hard. Stir in the heavy cream, then turn off the heat. Mix in the parmesan cheese, then taste and season with salt and black pepper as needed.
1 cup heavy cream, ½ cup freshly grated parmesan cheese
Serve hot with rolls or bread, garnished with more parmesan cheese.