Instead of prepared foods I give my kids cut up fruit and dip (really just flavored yogurt) or cut up vegetables and dip (just their favorite salad dressings) for their after school snack. They consider this a treat!
Oatmeal raisin cookies with a reduced amount of sugar or made with honey make a good on the go breakfast. I always have some in the freezer and they defrost in seconds in the microwave.