Arrange 4 of the tortillas on an ungreased baking sheet, and spread each one with a generous amount of the refried beans*. Spread about a tablespoon of enchilada sauce on top of the beans, then top with a tablespoon of vegan cheese.
Top with a second tortilla, pressing gently to flatten to the top of the pizza**. Spread 1-2 tablespoons of enchilada sauce onto the second tortilla. Sprinkle the tops with the tomato and olives, then cover the top of each Mexican pizza in another ¼ cup of cheese.
Bake for 25-30 minutes, until the cheese is melted and the tortillas get crispy on the edges. Use a pizza cutter to gently slice into quarters, then serve topped with the green onion and a side of avocado slices.
Notes
*You will have beans and enchilada sauce left over, and that's ok! Freeze them for later in a freezer-safe container.**This is key, because if the top isn't flat, your top layer of sauce will ooze right off of the edge.