Line a 9" springform pan with parchment paper. Lightly grease the pan with grapeseed oil, and set aside. 

In a bowl, cover the quinoa with at least 1 inch of water and soak the quinoa for at least 8 hours. Soaking longer will further reduce any bitter flavour from the quinoa.

Drain and rinse the quinoa, and transfer it to the cup of a food processor. Add the 1/4 cup water, baking powder and salt, and pulse until you have a smooth batter (about 2 minutes), scraping down the sides as needed to ensure an evenly texture .

Pour the batter into the pan, smoothing the surface with a spatula.

Bake the crust for 15 minutes at 400°F, then flip the crust (while removing the parchment paper) and cook for another 5 minutes, until the edges of the crust start to brown.

Add your marinara sauce and toppings of choice, and return to the oven for another 5-10 minutes until the toppings are well cooked and any cheese has melted nicely.