MUSHROOM POWDER FOR COOKING RECIPES

Steps:

• Put the butter in a microwave-safe container (a liquid measuring cup works well) and microwave until the butter is completely melted, 30 seconds to 1 minute. With a fork, whisk the flour into the butter to make a smooth mixture the texture of cake batter, then microwave until the roux is steaming hot and bubbling slightly around the edges, about 30 seconds.
• Scrape the roux into a 6- to 8-quart slow cooker and whisk in the stock and wine. Stir in the mushrooms, wild rice, celery, onion, carrot, chopped garlic, thyme and garlic powder. Season with 1 teaspoon salt and several generous grinds of black pepper. Cook on high until most of the rice grains are just slightly split open and the vegetables are tender, about 4 hours. (The soup can hold for 1 to 2 hours on the warm setting, but eventually the wild rice will overcook.)
• Turn the heat to warm. Put the sour cream in a small bowl and slowly whisk in a few spoonfuls of the hot soup until smooth, then stir the mixture into the soup. (This prevents the sour cream from separating.) If you’d like the soup to be thinner, whisk in warm broth or water to the desired consistency. Taste the soup and add more salt and pepper to taste.
• Divide the soup among bowls and top with chopped scallions or chives and dill. Reheat any leftovers on low until warm. (Boiling can cause the sour cream to break.)

Steps:

• Add the stock, heavy cream, porcini mushroom powder (if using), 1 teaspoon fresh thyme leaves and 2 teaspoons salt to a large pot. Bring to a boil over high.
• While the liquid comes to a boil, heat the oil over medium-high in a large (12-inch) nonstick skillet. Add the mushrooms, shallots, garlic and 2 teaspoons thyme leaves. Season generously with salt and pepper, and cook, stirring occasionally, until caramelized and tender, about 12 minutes. Add the port, and stir until the alcohol cooks off and the mixture is almost dry, about 2 minutes. Remove from the heat, set aside and cover to keep warm.
• Add the pasta to the boiling cream mixture, reduce the heat to medium and cook, stirring frequently with tongs, until the pasta is al dente and absorbs most of the liquid, and the sauce is silky, 6 to 7 minutes. (Stir constantly during the last couple minutes to ensure the pasta cooks evenly. Add a splash of water if needed to keep the mixture glossy.) Season to taste with salt and pepper.
• Transfer the pasta to bowls, top with the mushroom mixture and the remaining 1 teaspoon thyme leaves, and serve immediately.