Peanut butter porter BJCP category?

[skallywag_brewing]

I'm wondering what category a peanut butter porter would fall under? It is a robust porter, so would that be the category?

 

[treebeerd]

I would think 30a) Spice, Herb, Vegetable Beer, but another specialty category might fit better.

These are the commercial examples given.
Alesmith Speedway Stout, Bell’s Java Stout, Elysian Avatar Jasmine IPA, Founders Breakfast Stout, Rogue Chipotle Ale, Traquair Jacobite Ale, Young’s
Double Chocolate Stout