You may like this even if you don't have to avoid wheat or gluten. If you don't these flours and gluten's OK for you, the recipe can be modified back to a wheat-based crust; just use a total of 2 cups flour.
1 cup brown rice flour
1/2 cup potato starch
1/2 cup tapioca flour/starch (or adjust these 3 ingredients to total 2 cups)
1 Tbsp. baking powder
1/2 tsp. salt
1 Tbsp. sugar
3/4 to 1 cup water or milk, just off boiling (very hot!)
Preheat your oven to 400 degrees F, grease a pizza pan or baking sheet.
Stir together flours/starches, baking powder, salt, and sugar. Stir in the hot water or milk and stir until it forms a dough. Pat about 1/4" thick onto the pan you're using. Bake until just set, about 10-15 minutes, depending on thickness. Add your sauce and toppings and return the pizza to the oven until cheese is melted. (I like to put it under the broiler for 2 minutes instead, to get browned & bubbling bits on the cheese.)