In a large bowl, combine the shredded rotisserie chicken and taco sauce.
Microwave the tortillas for 30 seconds. Keep them covered while you assemble the tacos.
Using a pastry brush or spoon, apply a thin layer of vegetable oil to both sides of the tortilla. Place a small amount of the chicken mixture onto one half of the tortilla. Top with a little bit of cheese.
Gently fold the other half of the tortilla over the filling and press down. Place tortillas on an ungreased baking sheet.
Bake 12-15 minutes. Open the oven door and press down any tortillas that have started to open. Bake another 5 minutes. Serve warm.