If I'm going to the gym, 3 mornings a week, I will have porridge, I don't particularly like it but it keeps me full for a few hours, does the job. Although reading Bellasnana's comment I think you need a fairly big bowl of it to sustain you for a few hours. I've been hearing about fridge porridge, oats soaked overnight in natural yogurt, or almond milk, or just milk, then add fruit, never tried it but might give it a go. Non porridge days I either have banana and yogurt, which I've just eaten, or Cornflakes, or a couple of Shredded Wheat. I also have a couple of coffees.
One at 7ish and another a couple of hours later.