Add flour to a large mixing bowl. Make a well in the center and add egg, salt, and oil.
Gradually pour in lukewarm water while kneading the dough by hand. Knead until smooth and elastic—it should bounce back slightly when pressed.
Cover the dough with a damp towel and let rest for 1 hour. After resting, stretch and pull the dough several times with both hands.
Divide the dough into equal portions (about 2.5 oz, 70 g each). Shape into balls by pulling the dough downward and tucking it underneath.
Brush each dough ball generously with melted butter. Place them in a bowl, cover with a damp towel, and let rest for 30 minutes.
Flatten each ball into a thin sheet using your hands or a rolling pin. You can also stretch it by gently “throwing” it onto a flat surface.
Lift one edge of the dough and let it stretch naturally into your other hand. Repeat for each dough ball.
Stretch each dough sheet again—very thin for a crispy texture, or slightly thicker for a softer result.
Fry each dough sheet in a pan with 1 tablespoon of oil and a little melted butter.
Cook until golden brown and crispy on both sides. Serve immediately with sweetened condensed milk, sugar, or your favorite topping.