Lightly brush each corn tortilla on both sides with oil and place them on a large sheet pan, being careful not to overlap. Bake for 8-10 minutes, or until just crisp.
While the corn tortillas bake, mix the refried beans with taco seasoning.
Carefully remove the corn tortillas from the oven and spread about ¼ of the bean mixture on each. Top each tostada with about 2 tablespoons of shredded cheese. Return to the oven and bake until the cheese is just melted, about 5 minutes.
Remove from the oven, top tostadas as desired, and serve immediately.
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Notes
Taco Seasoning: In place of the homemade taco seasoning, use ¼ teaspoon each cumin, paprika, garlic powder, chili powder, onion powder, and a dash of salt.Add veggies: If desired, add up to ½ cup of carrot, sweet potato, or pumpkin puree to the refried beans. This adds a nice dose of veggies without overwhelming the flavor of the beans. Storage: It is best to serve these tostadas right away. If you happen to have leftovers, place them in a sealed container between layers of parchment paper. Reheat the tostadas on a baking sheet at 400 degrees for 5-7 minutes. Top and serve.