Follow these straightforward steps to create tasty rotisserie chicken tostadas:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Tostada Shells: Place the tostada shells on a baking sheet. Bake in the preheated oven for about 5 minutes or until they are crispy and golden.
3. Warm the Beans: In a small saucepan, heat the refried beans over low heat until warmed through.
4. Assemble the Tostadas: Spread a layer of refried beans on each tostada shell. Top with shredded rotisserie chicken, followed by lettuce, tomatoes, red onion, black olives, and queso fresco or cheese.
5. Serve with Toppings: Top with sour cream, salsa, and fresh cilantro as desired. Serve immediately while the tostadas are still warm and crispy.

By following these simple instructions, you will create an incredible dish that is both flavorful and satisfying!