You are not going to make any profit on 25 with breakfast, assuming it’s UK
I provide a continental breakfast with a choice, I lay everything out, if they don’t like it, then it’s not my issue, I do provide a good variety and my guests do comment on the variety and range. i bake homemade bread and scones which cost very little and very simple.
For 25 you control the breakfast, cereals , fruits and tea/coffee is plenty for the price you are charging. If I was and you are targeting budget clients, don’t give choices. Invest in a few little containers from Ikea so it looks nice and say there is breakfast if you fancy some.