Ive also found eating breakfast in the same place helps me slow down. When I worked as a server I showed up 15 minutes early, sat at the same bar stool, read the Oregonian and at that to go food I mentioned. Now I eat at my home desk and look over my calendar. I hope this helps and makes sense. I know you're going to customize your habits in a way that meets your needs. Cheers!
Prepare easily accessible breakfasts the night before such as overnight oats in the fridge (there are so many good recipes online), and putting fruit and a bag of nuts on the side that you can grab before you leave.
Smoothies are also a great option for when you have no time at all – blend everything the night before (oats, yoghurt, fresh and frozen fruits, peanut butter, protein powder, the options are limitless), then put it in the fridge and grab it when you leave.