Potatoes are affordable, easy to prepare, readily available, and go with almost any dish.
And they have some of the highest satiety to calorie ratios of any starchy carbohydrate (meaning they will fill you up more compared to say rice, pasta, or other carbs for the same amount of calories).
One of our favorite methods to prepare potatoes is with the air fryer. We have large, 5.8QT Corsori air fryers that hold enough potatoes for a several days of meals.