Preheat oven to 425 degrees unless using an out door grill.
Combine all ingredients in a bowl of an electric mixer fitted with regular beaters or whisk attachment (not dough hook or paddle attachment). Mix on low until combined. Scrape down bowl once. Turn mixer to high and mix for 3 minutes. The dough may clunk around in the mixer at first then soften up, this is fine. The dough will be soft and sticky.
Dust a work surface generously with more All Purpose Gluten-free Flour Blend or white rice or sorghum flour. Knead the dough a few times until it is smooth and no longer sticky. You can use the dough now or save to use later. If using later, wrap tightly in plastic wrap and store in the fridge. It will puff up and rise slightly which is fine.
Pull off golf ball sized pieces, roll into a ball and roll out with a floured rolling pin, rolling in one direction at a time, turning the disk with each roll. Roll until about 5 or 6 inches in diameter and thin. Dust off any excess flour with a pastry brush.
Heat a grill pan over high heat or heat an outdoor grill to medium. If using an outdoor grill, lightly oil the grate. Place the rolled out pizzas on the grill pan or grates and cook about 2 -3 minutes per side or until as charred as you like. The dough may puff up while cooking, flatten it down if so. If cooking on an outdoor grill, add any topping you like and lower the lid, cook for about 5 minutes or until the cheese (if using) is melted and the toppings are hot. If cooking on a grill pan, flip over and cook another 2 – 3 minutes. Top with desired toppings and put in the preheated oven for about 5 minutes or until the toppings are hot and cheese (if using) is bubbly.
If you need to make the pizza crusts ahead you can grill them up to one day before and store, wrapped in plastic at room temperature.
Note - I used my own flour blend for the pizza dough but you can substitute the 1½ cups of my flour blend and 1½ teaspoons of xanthan gum with 2/3 cup sorghum, ½ cup tapioca starch, 1/3 cup sweet rice flour and 2 teaspoons xanthan gum. This will make a more “whole wheat” tasting pizza crust. Nutrition facts calculated for the crust only, not including toppings of choice.