Murphy or father Ted's always had good breakfasts, if you hit a thai place up then generally it's not as authentic I.e they give hot dog instead of trad English sausage.
If you want the best breakfast imo then head to the coffee club. There's one in blue port also used to be one by hilton on corner. Avocado, bacon, poached eggs, tomatoes etc plus a pistachio crush which I was hesitant at first but actually goes well together. Not the cheapest though!