Mushrooms are good for breakfast. Fry them up in some olive oil, put in a bit of onion if you like it, some half tomatoes stewing/frying next to them and have that with toast. Takes very little time and you will find the mushrooms filling.
Or get yourself a rice cooker and have bowl of rice with vegies on it for breakfast. Leftovers from the night before or some fried up vegies. You can cook a whole pot of rice and then wrap it in saran wrap in individual portions and freeze it, microwave the next day and add veg. You don't need a rice cooker of course, but it is an easy way to make rice that sticks together nicely for using like this.
Thank you for the suggestions, using leftovers will definitely be something I employ. I have a slow cooker so I can do those rice ideas. The toast idea sounds absolutely delicious, I love fried mushrooms.