There are only a few meals at WDW that require the use of two credits when using the Disney Dining Plan. These are primarily dinner shows and signature gourmet meals, as well as Cinderella's Royal Table. The other character meals, including Chef Mickey's and Crystal Palace are one-credit meals.
You may be interested in the Disney Dining Plan brochure, which can be downloaded from the WDW website.
This includes a listing of all restaurants that are on the Dining Plan,
as well as additional information about number of credits used, counter
service vs. table service, etc.
To download the brochure, click
HERE, then click on the Disney Dining Plan card, then click on "Download Disney Dining Plan PDF."
Have a wonderful trip to Walt Disney World.