In a small bowl mix the psyllium husk with water and let sit for 5 minutes or until it will have a jelly consistency
in another bowl add potato starch, brown and white rice flour, xanthan gum powder, sugar (if using maple syrup, add it with the liquids in the next step) and yeast. Mix well
add water
add 1 tablespoon of olive oil and the psyllium husk mixture
with a spoon thoroughly mix all the ingredients for 2-3 minutes, making sure all the dry ingredients are incorporated and there are no clumps in the mixture. If clumps form, press on them with the spoon to dissolve them and mix the batter again
add salt, if using, and mix well
you should get a very soft dough (not liquid, not runny)
using a spatula, press the dough from the outer edges to the centre to make it more compact
drizzle with a tablespoon of olive oil, making sure it also goes under the dough
cover with cling film and a towel and let rise at room temperature for 2 hours, until the dough doubles in size
place a baking sheet or a cookie sheet at the bottom of the oven (not on the lower rack, but directly on the oven surface) and pre-heat the oven at 230°C / 445 F for at least 30 minutes
place a square of parchment paper on a worktop and dust it with white rice flour
move the dough on the floured parchment paper: the dough should be soft and a bit sticky
dust the dough with a teaspoon of white rice flour and lightly press the dough together
also use a spatula to "collect" the dough from the outside and lightly pushing it towards the inside
add a bit more white rice flour and proceed to lightly kneeding the dough until it holds a round shape and is not sticky (don't overdo with the rice flour or the dough might become too "dry")
always working on the floured piece of parchment paper, lightly and carefully press the dough with your fingers, starting from the center towards the outer edge
keep going until you have a 30 cm/12 inch diameter disk
a few moments before baking, cover the crust base with your favorite pizza sauce, leaving out 1 cm / half inch at the edges
top with your favorite ingredients and lightly brush the edges with olive oil
using a mitten, remove the baking/cookie sheet from the oven
without removing it from the parchment paper, carefully slide the pizza on the baking sheet and place it back at the bottom of the oven
let bake for 12 minutes: the bottom of the dough and the crust edge should get lightly golden
move the baking sheet with the pizza on the middle rack in the oven and let cook for another 2-3 minutes, or until the pizza crust has a nice golden/browned color and the toppings are nicely baked (and cheese is melted, if using)
plate and enjoy right out of the oven!