I don't offer breakfast but when parents about to leave I offer kids Cheerios just to distract them which is working perfect! and I ask each parents about their kids night. If they slept well and ate their breakfast etc.? We all have busy life's and we can forget things and also I would like to know my stuff so that I can prepare for the day.

Beside, my dck's comes at 8am and I know they normally wake up between 6-6:30am so they all had their breakfast before they come here.

You can either ask each parents like I do or make small portions so that you don't have to throw food. I like your intention though.