Soak cashews in hot water 15+ minutes, or cold water 4+ hours. Drain.
Sauté onion, carrots, and celery in olive oil for 5-7 minutes. Add garlic, cook 1 minute more.
Add mushrooms, cook 6-8 minutes until browned.
Sprinkle in flour, stir to coat, cook 1-2 minutes.
Add wild rice, broth, thyme, and rosemary. Bring to a boil, then simmer covered 45-55 minutes until rice is tender.
Blend drained cashews with 1 cup fresh water until completely smooth.
Stir cashew cream into the pot, simmer uncovered 5 minutes.
Season with salt and pepper, garnish with parsley, and serve.