A protein shake can be pretty good breakfast. It will also give your muscles the energy they need to recover from your workout.
A simple recipe:
Milk or Water
Ice
Scoop of dry whey protein of your favorite flavor. (@ your local health store)
~1/3C Ground Oatmeal (I buy it and grind it in the blender then re-store it)
Frozen Berries of your choice.
Throw it all in a blender and grind.
To save time and not use the blender you can omit the frozen berries. They taste good, but sometimes it's easier to just throw it all in a bottle + shake.
Alternatively, granola bars can be good breakfast. Just check the packaging to make sure you're not getting the kind loaded with sugar.