The Schema plugin is made to markup general and basic WordPress content, this to keep it valid for every type of site out there, example:
- Blog
- Pages
- Posts
- Categories
- Author archive pages
- About page
- Contact us page
Also, Schema won’t output anything on the front-page (no HTML, scripts, or styles), this should be left for extensions.
At this point, there is no extensions available, but I plan to develop a few useful extensions in the near future, one of them will be for Reviews and another for Recipes.
If you are looking for a plugin for WordPress that supports recipes, the only one I can recommend is my own developed premium plugin (not free), it’s called WPRichSnippets, it supports schema for Recipes and have a clean front-end display.
Demo examples:
Why? Because this is the only plugin I can guarantee it will work!
Cheers.