The expensive part of this is a protein powder, but if you plan on getting one anyway, this is a super easy pancake recipe that has a bit more health and heft.
Cream of Wheat was a staple of my unpaid internship days. Shelf stable, great source of iron, dead easy to make on stovetop or microwave. I like it with cinnamon, which is a low cost spice, and a bit of sugar or butter. 20 cents per serving - you honestly cannot get a better deal on breakfast.