Preheat your oven to 190°C (375°F).
Remove all the meat from the rotisserie chicken and shred it well. You should have about 3 cups. Set aside.
Pour about 180ml of enchilada sauce into the bottom of a 9×13-inch baking dish, spreading it to cover the base.
Take one tortilla and place about 60ml (¼ cup) of shredded chicken down the centre. Add a couple of generous spoonfuls of queso and a drizzle of enchilada sauce. Roll up tightly and place seam-side down in the dish. Repeat with remaining tortillas.
Pour the remaining enchilada sauce over the top of all the enchiladas. Add extra spoonfuls of queso down the middle.
If using olives or any other toppings, scatter them over now.
Cover the dish tightly with foil and bake for 30 minutes until hot, bubbly, and the cheese is melted.
Remove the foil for the last 5 minutes if you want the top to brown slightly. Serve hot!