Rinse and drain the canned white beans and put them in a blender together with the tigernut, the lemon juice, and the nutritional yeast. If you want to make it a bit easier for your blender, you can soak them in water for 4-6 hours before using them. Put aside.
Heat some oil in a large pan and sauté the onion for about 3 minutes until they become translucent. After 2 minutes, add the garlic. Then add 2 cups of the spinach and cook for 3 more minutes. Season with salt, pepper, and red pepper flakes.
On the pizza dough cut the artichoke hearts in quarters and put them on the pizza together with the remaining spinach. Sprinkle with the vegan cheese.
Bake the pizza for 8 minutes or check out the instructions on the package (each pre-made pizza dough is different).