Soak the quinoa: Place 1/2 cup of quinoa in a bowl and cover it with hot water. Let it soak for a couple of hours.
Preheat the oven: Set your oven to 350°F (175°C) and line a baking sheet with parchment paper.
Rinse and blend: After soaking, rinse the quinoa thoroughly and drain well. In a food processor, combine the soaked quinoa, chickpea flour, vegetable broth, garlic powder, onion powder, and sea salt. Blend until you achieve a smooth batter.
Spread the batter: Pour the batter onto the prepared baking sheet. Use a spatula to spread it evenly into a thin crust.
Bake the crust: Place the baking sheet in the preheated oven and bake for 8-10 minutes, or until the crust is firm and set.
Add toppings: Remove the crust from the oven. Spread marinara sauce evenly over the surface, leaving a small border around the edges. Sprinkle vegan cheese on top of the sauce.
Bake the pizza: Return the pizza to the oven and bake for another 4-5 minutes, or until the vegan cheese has melted and is bubbly.
Broil (optional): For a golden finish, turn on the broiler and broil the pizza for 1-2 minutes to slightly brown the cheese.
Serve: Take the pizza out of the oven and let it cool for a minute before slicing. Serve hot and enjoy your high-protein quinoa chickpea pizza!