Well I'll start by saying that I would eat that brownie for breakfast right now!
I used to HAVE to eat breakfast within a few minutes of waking or else get nauseous. I have since trained my body to fast longer and I feel so much better. However, just because my breakfast happens to be closer to noon than 6 am, it is still my fast break!
Eggs. I hate how expensive they are getting but yes...eggs. The perfect food and if you have good producing chickens, you're golden! Add some good fat to that, avocado or even a couple slices of quality bacon and you'll be set for hours!
That's my non-professional opinion ;)
I just love eggs.