Healthiest cooking methods for meal prep include techniques such as steaming, grilling, baking, and sautéing with minimal oil. These methods retain more nutrients, reduce the need for added fats, and encourage the use of whole ingredients. Steaming preserves vitamins and minerals, while grilling and baking allow fats to drain away from foods. Additionally, sautéing with healthy oils can enhance flavor without compromising health. Choosing these cooking methods promotes healthier meals that are both nutritious and delicious.