Meanwhile, prepare the cheese sauce. Drain and rinse cashews and place in a high-speed blender or food processor with vegetable broth, yeast flakes, coconut milk, onion, garlic, salt, paprika, and cayenne pepper. Process until smooth and creamy.
Now, let's create layers of deliciousness. Spray a casserole or baking dish with oil. Arrange the potato slices and green onions at the base of the dish, and pour the cheese sauce over them. Repeat these layers, and finish off with a sprinkle of vegan cheese shreds for that extra burst of flavor.
Cover the casserole dish with parchment paper, then foil on top, and bake for 40 minutes. Remove the cover and bake for 20 minutes or until the potatoes are tender and the top golden.
Sprinkle top with fresh, chopped green onions, and serve!