To add a Mickey Mouse Celebration Cake to a dining reservation at Walt Disney World in 2026, you primarily use the My Disney Experience app or website. When you are making or modifying a Table-Service restaurant reservation, you will often see an "Add-Ons" section where the cake can be selected. These cakes serve 4 to 6 guests and come in chocolate or white chocolate flavors with "Happy Birthday" or "Congratulations" ears. If you have already made a reservation and the option isn't showing, you can visit the Podium/Host Stand at the restaurant at least four days in advance to request one, or check for "day-of" availability, though it is not guaranteed. You must pay for the cake at the time of the meal. For more elaborate, custom-designed cakes that go beyond the standard Mickey shape, you must call the Walt Disney World Specialty Cake Hotline at least two weeks prior to your visit. This allows for a more personalized celebration at select locations like the Grand Floridian or Contemporary Resort.