For Easy Homemade Hard Shells: Warm 8-12 corn tortillas for 30 seconds to 1 minute in the microwave, until pliable. On a baking sheet, rub the tortillas with olive oil. Lay each tortilla flat and then layer evenly with cheese and potatoes. Fold the other half of the tortilla over the filling, gently pushing to adhere (see above photo). Transfer to the oven and bake for 5-8 minutes, then flip and cook another 5 minutes more, or until the cheese has melted and the tortillas are crisp.