Kraft Mac n cheese. You can add all sorts of stuff to it to make it stretch and be somewhat healthier. Frozen riced cauliflower, onions, beans, hot dogs, whatever.
Suddenly salad works well this way too. Add tomato, carrot, bell pepper, etc.
I used to do the same with instant ramen but the sodium level in it is way too high for me to eat anymore.
Writing is on the wall. Xbox and Windows made money, but a fraction of what Office and enterprise services made.