In a large bowl, combine the potato flour, baking powder, salt, and sugar. Mix well.
Pour in the warm water and olive oil, then mix until a smooth dough forms.
Pour the dough into an olive oil-greased baking sheet, spreading it out evenly.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the focaccia is golden brown and crispy.
After baking, let it cool for 10 minutes before slicing and serving.
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