4 quick black tostadas Recipes

low-fat milk, salt, freshly ground black pepper, egg whites, eggs, corn tortillas, shredded reduced-fat sharp cheddar cheese, canned black beans, rinsed and drained, chopped green onions, bottled salsa, fat-free sour cream

corn tostada shells, refried beans, shredded cheddar cheese, divided, chipotle peppers in adobo sauce, salsa, chopped fresh cilantro, divided, black beans, drained, butter , or as needed, eggs

corn tortillas, chili powder, black beans, drained and rinsed, low-fat shredded cheddar cheese, tomato, chopped, lettuce, shredded, salsa (optional, for serving)