This popular breakfast has been one of the lower cost special events during Epcot's Annual Food & Wine Festival. It's not uncommon for certain days to be booked out long before the festival begins (i.e. the "first" one of the season seems to book out insanely fast).
The bright and open Chefs de France location takes on a "Parisian Cafe" vibe during the morning hours. Even though the restaurant is packed full of guests , the space doesn't often feel crowded and there's hardly ever a line at the pastry tables. The main dining area picks up yellow and orange hues from the morning light, and feels very French-country.
There are quite a few pastries available (buffet-style), along with assorted cheese, meat, and fruit offerings. The pastries and baked goods are made fresh hourly at the nearby Les Halles Boulangerie & Patisserie, and they are one of the main "culinary" features of this event. Some of the offerings range from the "simple" (but yummy) croissants (plain and chocolate chipped), to more complex items like the Croque Monsieur, which combines ham and baked cheese on fresh bread. Tables are duplicated on opposite sides of a column, so there's not often a build-up of guests waiting in line.
Beverages include Mimosas that are made table-side along with various coffee, tea, and juice offerings (I'm sure that sodas are available as well, but the Mimosas are the real stars here).
All cast members are dressed in their finest attire, and while the Parisian Breakfast is a bit more casual than say, dinner... there's always a hint of fine French formality in the air. The price, dates, and items available do change a bit from year to year, but stay pretty close to the description above.