Brush each corn tortilla lightly with cooking oil and arrange them in a single layer on a baking sheet. Bake for about 10 minutes, or until crisp and lightly golden.
In a large mixing bowl, combine shredded rotisserie chicken, salsa, and taco seasoning mix. Stir until well-mixed.
Spread a layer of black beans over each crispy tortilla.
Layer the chicken mixture on top of the black beans evenly.
Sprinkle canned corn and shredded colby jack cheese on top.
Return to the oven for 5 minutes, or until the cheese is melted and bubbly.
Remove from the oven and top each tostada with fresh cilantro leaves and diced tomatoes. Serve with lime wedges.
Notes
For best results, brush both sides of the tortillas with oil for extra crispiness. Freeze components separately for optimal texture when reheating.