I also get enough food items for the week at the beginning of the week. And sometimes I keep it really simple, a handful of nuts, some yogurt or cottage cheese, and a banana for breakfast on days when I'm busy or don't feel like doing a big prep.
Plan in advance what you are going to have…ensure to have supplies in the fridge/cupboard.
This is generally one of the simplest solution for the lack of time. Other solutions might consist in eliminating some of the time consuming junk-activities.
In my case however, since I do almost nothing I shouldn't be wasting my time on, the only option to make more time is getting up earlier. I'm start my days at 4:15 am.
Try prepping breakfast the night before. Things like overnight oats that you can mix with your favorite fruit and granola/meusli. Cut up some fruit or have fruit like apples and pears available to grab and go. Have bags of your favorite nuts and seed ready to snack on. Avocado or a nut butter on toast will fill you up and have you energized for your day. Also, who says you can't have last night's leftovers for breakfast?
To sum it up, keep it simple and easy, try to do all the prep the night before, have a no prep option available for those days you just don't have the time and just like any other meeting, schedule breakfast into your calendar.
The thing is to make breakfast healthy and diverse. Healthy-done. Diverse – need to think about it