Recipe Taxonomies
See the Recipe Taxonomies feature in action
The free version includes courses and cuisines as recipe taxonomies, but in WP Recipe Maker Premium you have full control and can create as many recipe taxonomies as you want. Think "Difficulty", "Skill Level", "Price" or whatever else you need.
Recipe Taxonomies can be added and edited on the WP Recipe Maker > Manage > Your Custom Fields > Recipe Taxonomies page:
Use the blue button to create a new one: