In a medium mixing bowl, add garbanzo flour, sea salt, baking powder, garlic powder, and nutritional yeast and whisk to combine. Then pour warm water into dry ingredients and whisk until smooth (add the water slowly, and if it starts to look too runny - it should be a thin but not a watery crepe-like consistency - refrain from adding all the water). Cover and let rest for 30 minutes.
In the meantime, heat oven to 425 degrees F (204 C). Once the batter has rested, add the olive oil and oregano (optional) and stir to combine.
Heat a large (12-inch) oven-safe cast-iron or metal skillet over low-medium heat (if using a smaller skillet, this will make two small pizzas instead of one large pizza). If using a non-stick pan or a cast-iron that's seasoned, it shouldn’t need more oil. But if your pan tends to stick, add a little oil - it won’t hurt.
Add the chickpea batter into the greased, hot skillet and move the pan around to allow batter to flatten like a large pancake, leaving a little room on the very edges of the pan to allow room for a spatula to slide under. Add onion and cook for 1 minute. Then carefully transfer skillet to the oven and bake 10-15 minutes or until bubbles have formed, the edges have browned, and the top is slightly golden brown.
Remove from oven after baking, gently loosen with a spatula, and slice on a cutting board (or slice right in the pan). Then add remaining toppings of choice. We went with chopped sun-dried tomatoes, macadamia cheese, arugula, raw chopped garlic, and vegan pesto. Vegan parmesan and/or red pepper flake can also make nice additions.
Best when fresh. Store leftovers in the refrigerator up to 3-4 days. Reheat in a 350 degree F (176 C) oven until hot (arugula does not reheat well).
*If using fresh tomatoes instead of sun-dried, add to the socca when adding the onion so they bake into the crust. *If using a store-bought shredded cheese instead of fresh nut cheese, add to the socca when adding the onion so it has a chance to melt and bake into the crust. Find the recipe for the Macadamia Nut Cheese here. *Nutrition information is a rough estimate calculated without optional ingredients.