Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.

Brush both sides of each corn tortilla lightly with olive oil and sprinkle with a pinch of salt.

Place the tortillas in a single layer on the prepared baking sheet and bake for 5-7 minutes per side, or until they are golden and crispy.

While the tortillas are baking, warm the refried beans in a small saucepan over medium-low heat, stirring occasionally.

Remove the baked tortillas from the oven and allow them to cool slightly.

Spread a layer of warm refried beans evenly over each tortilla.

Top the beans with shredded lettuce, diced tomatoes, shredded cheese, and any optional toppings like black olives or chopped cilantro.

Drizzle sour cream over the tostadas or serve it on the side for dipping.

Serve immediately and enjoy!