Hi Alicia,
Thanks for submitting your question to us here at the Disney Parks Moms Panel!
How exciting to be planning
breakfast at Cinderella's Royal Table-it's one of my favorite restaurants. My daughter is in love with it and has requested this very same meal several times. I've provided a link for you to view the menu for each meal at this particular restaurant location; this is not a buffet experience but there is quite a bit of variety on the menu. At the current time, this restaurant is prix fixe (one price for the experience) with an additional charge for specific specialty menu items such as alcoholic beverages; this is subject to change without notice.
Entering the Magic Kingdom, even if just for breakfast, will use a day on your park tickets. If you have a Park Hopper ticket, this should not impact your plans for the day. If you have a single-park ticket, you will want to plan your entire day within the Magic Kingdom to ensure you just use one day of your park tickets.
Alicia, I'm so glad you stopped by with your question. I hope you have a fantastic breakfast! Please come back and see us if you have any additional questions about your upcoming Walt Disney World Resort vacation.
Best Wishes,
Amy S.