Take 4 very large sheets of tin foil and crumble them into 4 balls (approximately 4 inch ball diameter). Press the foil balls into the table on both sides to make a flatter base (for stability) and a flatter top.
Put the foil balls on a baking sheet.
Heat the tortillas in the microwave for 30 seconds.
Lightly brush the tortillas with olive oil on both sides.
Pick the tortillas with the fork in several places.
Put the tortillas on top of the foil balls and press down the sides of the tortillas to drape them over the foil.
Put the tortilla shells in the oven and bake for 10 minutes (or until crispy and lightly browned).
Remove the tortilla shells from the oven and let cool for 5 minutes.
Carefully flip the tortilla bowls over and remove the foil balls.