Combine yeast, sugar, and water in a bowl. Leave to bloom for 10 minutes.
Combine the brown rice flour, potato starch, tapioca flour, cornmeal, xanthan gum, and salt in a bowl.
Add the olive oil and active yeast mixture into the dry ingredients.
Knead the dough on a lightly floured surface.
Set the dough to rise in a lightly oiled bowl. Leave for an hour.
Brush a rectangular pan with olive oil. Dust with more cornmeal.
Press the dough onto the prepared pizza pan.
Pre-bake the dough for 5 minutes at 425 F.
Top the pizza.
Bake for 10-15 minutes at 425F.