Nutritionally dense and high in vitamin C, beta-carotene, and other carotenoids, bell peppers are good for your skin, immune system, and eyes. For variety, add diced zucchini to the peppers, or substitute black beans, corn, and cilantro.
Heat the oil in a large skillet over medium heat, add the peppers, and sauté until soft, about 10 minutes. Transfer into a bowl and combine with the scallions, cumin, salt, pepper, and red pepper flakes.
Heat a second large skillet over medium heat. Add 1 tortilla, and top with 1/4 cup bell pepper mixture. Sprinkle with 1/4 cup cheese, top with a second tortilla, and cook 2 minutes each side, or until golden, pressing down with spatula. Repeat with remaining tortillas, bell pepper mixture, and cheese.