Preheat the oven to 400°F (200°C). Place the tortillas on a baking sheet and lightly spray or brush them with olive oil. Bake for 8-10 minutes until crisp.
While the tortillas are baking, heat the olive oil in a skillet over medium heat. Add the diced onion and cook until softened, about 3-4 minutes. Stir in the minced garlic and cook for an additional 1 minute.
Add the black beans to the skillet along with the ground cumin, chili powder, salt, and pepper. Cook for 5-6 minutes, stirring occasionally, until the beans are heated through and well-coated with the spices.
To assemble the tostadas, spread a layer of the seasoned black beans onto each crispy tortilla. Top with shredded lettuce, diced tomato, avocado slices, and chopped cilantro.
Serve the tostadas immediately with lime wedges on the side for squeezing over the top. Optionally, offer salsa, sour cream, or shredded cheese for additional toppings.
Notes
Tips for Success
Bake the tortillas until crisp. This helps them hold up well under the toppings.
Warm the beans well. Heating them with the spices allows the flavors to blend together.
Add toppings just before serving. This keeps the tostadas from becoming soggy.
Use fresh lime juice. A squeeze of lime brightens all the flavors.
How to Store
Black bean tostadas are best enjoyed fresh, but you can store the components separately if needed.
Keep the seasoned black beans in an airtight container in the refrigerator for up to 3–4 days. Reheat them in a skillet or microwave before serving.
The toppings can also be stored separately in the refrigerator. For the best texture, assemble the tostadas right before serving so the tortillas stay crisp.