In a food processor, pulse flour, salt, and chilled butter until sandy. Add the ice water, until a smooth dough comes together and pulls from the sides.
Wrap in cling film and refrigerate for about 30 minutes.
Preheat oven to 375 degrees F.
On a lightly floured surface, roll out the dough into a ¼-inch thick circle.
Place on a parchment-lined baking sheet and drizzle with olive oil. Add all your desired toppings.
Fold the edges over and brush with the beaten egg.
Drizzle with a little more olive oil, and bake for 25-30 minutes until golden brown and the cheese is bubbling.
Remove and let cool for about 5 minutes before serving.
