Make the Dough - Mix flour, salt, melted butter, water. Stir until smooth. Add more flour/water if needed. Rest for 5 minutes. Form dough into flattened balls. Add cheese if desired. Place on greased parchment and repeat.
Fry the Dough - Fry in oil, flip until golden brown (5-8 min per side). Drain on paper towels. Cool on a wire rack. Split and add filling such as chicken, pork, guacamole, butter, or maple syrup, or enjoy plain.