Soak the cashews in hot water for about 30 minutes.
Heat olive oil in a large soup pot and sauté onions, carrots, celery, leek, and kosher salt for 12–14 minutes until onions are translucent.
Stir in garlic, chili flakes, nutritional yeast, and poultry seasoning. Add 5 cups of vegetable broth and white beans, bring to a simmer and cook for 15 minutes until veggies are tender.
Drain and rinse soaked cashews, blend with the remaining cup of vegetable broth until smooth.
Add cashew cream and chopped kale to the pot, simmer for 5-10 minutes until kale wilts and soup thickens.
Season with salt and pepper to taste, serve topped with fresh parsley and chili flakes if desired.