Mix flour, lard, salt and baking powder in a mixer. Add water and mix to combine. Add potatoes and mix on first (low) speed for 7 minutes. Roll dough into about 40 balls. Place one ball on a floured surface. Roll in one direction with medium pressure. Flip tortilla and roll in other direction. Cook over medium heat for 20 seconds. Flip and cook opposite side.
Repeat with remaining dough balls.