Spicy Black Bean and Chicken Tostadas with Avocado, Lettuce and Sour Cream Sandwiches & Handheld Itemsbean recipe, bean tostada, chicken tostada, Northarvest Bean Growers, school lunch recipe, The Culinary Institute of America, tostada recipe, video This tostada is topped with spicy black beans, chicken fajita strips, avocado, tomatoes and shredded lettuce and cheese. The same toppings could also be used for a healthier take on nachos. Chef Samuel developed this recipe for a high school foodservice audience.