Preheat oven to 400°
Cut your pita's horizontally in half. So you should get 2 rounds out of each bread.
Next, brush one round with olive oil. Stack the next round on top and brush it with olive oil (the oil from the bottom one will rub off on the bottom of the next, thus, oiling both sides for you in a flash).
Brush and stack each round. Next, slice in half and then in half again, so you have quarters.
Arrange the pieces evenly on large baking sheets (it takes at least 2). Try not to overlap.
Sprinkle with oregano, salt and pepper.
Bake for 6-8 minutes, then flip.
Bake the other side for another 6-8 minutes until crisp and lightly browned. They'll crisp up more when they cool.