Breakfast is actually pretty easy to make 1) cheap and 2) easy to prepare.
It takes about 5 minutes to grill an egg or boil one. If you soak oatmeal overnight, it takes about 10 minutes to fully cook. You can make toast or hashbrowns in about that amount of time as well.
My routine is often start heating some food, then go brush my teeth while it's heating, so no time wasted.
Small condiments can add a lot of variety -- buy a tub of yogurt, cream, cheese, salmon slices, sausage, etc., then just mix and match. You won't have to have the same meal twice in a week.
And if cooking is simply too much of a hassle, why not just buy some apples, oranges, or whatever fruit suits your fancy, and just eat it whole? Pretty sure everyone agrees that fruit is healthy, and they're cheap.