To get a detailed breakdown of the day's breakfasts, from the menu go to Booking > Breakfasts.
This report will show all bookings for rate plans that include breakfast in their 'Board type' setting, plus any bookings with additional 'Breakfast' type Extras that have been configured with a 'Morning' charge type.
Breakfasts are also able to be reported over a date rage in the Occupancy report, along with fields for Adult and Child guests during the period.