You can use a whole bunch of spinach on this pizza which looks really excessive because usually pizza toppings aren't loaded 3 inches high. I bet that even those who don't normally like to eat green things will love this. And the roasted garlic and caramelized onions add good smells to your house.
I made my usual homemade pizza dough. You could also use a thin pre-made crust — preferably one with some whole grain in it.