Keto Flatbread Pizza with Pesto and Mozzarella

1. Preheat your oven to 350F (175C). 2. In a bowl, mix together the almond flour, coconut flour, psyllium husk powder, baking powder, and sea salt. 3. Add the boiling water and olive oil to the dry ingredients and stir until a dough forms. 4. Roll out the dough between two pieces of parchment paper until it's about 1/4 inch thick. 5. Bake the flatbread in the preheated oven for about 15 minutes, or until it's firm and slightly golden. 6. Remove the flatbread from the oven and spread the pesto on top. 7. Sprinkle the mozzarella cheese over the pesto, then add the cherry tomatoes, black olives, and red onion. 8. Return the pizza to the oven and bake for another 10 minutes, or until the cheese is melted and bubbly. 9. Let the pizza cool for a few minutes before slicing and serving.