Preheat an oven to 220 degrees C. Line a baking tray with baking paper, then lightly grease the paper.
Stir the flour, gram flour, cornflour, tapioca starch, baking powder, xanthan gum, Italian seasoning, oregano, salt and Parmesan cheese together in a bowl then set aside.
Dissolve 1 teaspoon of sugar in the lukewarm water in a small bowl. Sprinkle the yeast over top and set aside until foamy, 3 to 5 minutes.
Beat the egg in a separate bowl with the olive oil, vinegar, 1 teaspoon sugar and the garlic until smooth. Once the yeast is foamy, whisk it into the egg mixture then stir in the flour until no dry lumps remain.
Press the dough into the prepared tray, leaving the outer edge slightly thicker than the center.
Partially bake in the preheated oven for 10 to 12 minutes until the dough has risen and has slightly firmed.
Remove from the oven and top with your favourite toppings then continue baking until the crust is golden brown, 20 to 30 minutes. Remove the pizza from the pan and cook directly on the oven rack for 5 minutes to crisp crust, if desired.