Yes, you can add breakfast to your Disneyland Paris booking even after your initial reservation is confirmed. The most efficient way to do this is by adding a Meal Plan (Standard, Plus, or Extra Plus) to your hotel package via the "Manage My Booking" section on the official website or by calling the Disney reservation center. Most Disney Hotel bookings include the option of a "Half Board" or "Full Board" plan, both of which include a buffet breakfast at your specific hotel. If you do not want a full meal plan, you can still book breakfast-only options or simply pay out-of-pocket at your hotel’s restaurant or at locations in the Disney Village, such as Earl of Sandwich or Starbucks. For a special experience, you can also upgrade to a Character Breakfast at Plaza Gardens Restaurant, though these require advance reservations due to high demand.