Meanwhile, steam the broccoli in a saucepan or pot on the stove, microwave, or pressure cooker.
Combine the cashews, nutritional yeast, and remaining 1 cup broth in a blender and puree until completely smooth. When the cauliflower is very tender, add the cashew mixture to the pot. Using an immersion blender, blend the soup until creamy. Stir in the steamed broccoli. Season with salt and pepper.
Notes
Nut-Free Option: Substitute sunflower seeds for the cashews.