Am at the end of my tether today. 2.7yr old DD, moderately fussy eater but has her safe foods for most meals (albeit quite reduced when it comes to healthy foods - will typically eat any amount of "orange" foods) has started to refuse, or should I say just not eat her breakfast staple of wholemeal toast & peanut butter with cucumber; she usually eats the cucumber but for the last 5+ days has just licked off the peanut butter and declared herself "finished!" in a cheery tone. She will then day she's hungry again an hr later and badger me for snacks, but this is usually when we are getting ready to leave the house or already out and just isn't possible half the time - besides which I want her to get into the habit of eating breakfast with the rest of us! It's really annoying and I'm afraid I lost it a bit this morning... 
For clarity, she has eaten this happily for ages till this past week, she won't eat any cereals I've tried (most stuff Inc porridge) and won't have toast with anything else on. She will eat egg but only scrambled but I can't do that every morning and besides she should have some carb....
Please help!!