Making Easy Mini Sheet Pan Tostadas is an enjoyable and simple process. Just follow these steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C) to ensure a crispy base for the tostadas.
2. Prepare the Tortillas: Arrange the corn tortillas on a large baking sheet, spacing them evenly.
3. Bake the Tortillas: Bake the tortillas for about 5-7 minutes or until they begin to crisp up and turn golden brown.
4. Layer Proteins: Remove the tortillas from the oven. Top each tortilla with a spoonful of shredded chicken or black beans.
5. Add Cheese: Evenly sprinkle shredded cheese over all the tortillas to create a delicious melty layer.
6. Add Vegetables: Top each tortilla with diced tomatoes, red onion, and corn.
7. Season: Sprinkle salt and pepper over the toppings for added flavor.
8. Return to Oven: Place the sheet back in the oven and bake for an additional 5 minutes, until the cheese melts and the vegetables are heated through.
9. Garnish: Remove from the oven and add fresh cilantro, avocado slices, and any additional toppings you desire.
10. Serve: Squeeze lime juice over the tostadas and serve hot with sour cream on the side for dipping.

Now your Easy Mini Sheet Pan Tostadas are ready to be enjoyed!