In a large bowl, combine the flour, baking powder, and salt. Add the warm water and 4 tablespoons of oil. Mix until a dough forms. If the mixture is too wet, add 1 more tablespoon of flour at a time until it comes together.
Transfer the dough to a lightly floured surface and knead for 8 to 12 minutes until it is smooth and elastic. Shape the dough into a ball, cover with a kitchen towel, and let it rest for 30 minutes.
Divide the rested dough into 8 pieces. Roll each piece on a lightly floured surface into an 8- to 10-inch thin circle (or use a tortilla press). Heat enough vegetable oil in a deep pan (about 1 to 2 inches deep) and bring the oil to 350°F.
Fry each dough circle for about 40-60 seconds per side, or until golden brown. Remove and drain on paper towels. While still warm, sprinkle evenly with a mixture of granulated sugar and ground cinnamon.