For fast and easy homemade tostada shells with fresh roasted-corn flavor, we coated 6-inch corn tortillas in oil, arranged them on a rimmed baking sheet, and crisped them in a 350-degree oven. For fast and easy homemade tostada shells with fresh roasted-corn flavor, we coated 6-inch corn tortillas in oil, arranged them on a rimmed baking sheet, and crisped them in a 350-degree oven. Inverted wire cooling racks placed on top of the tortillas ensured that they stayed flat while baking.
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