World Centric makes single use plates, bowls, spoons, forks and cups from 70% non-GMO corn and 30% talc. No petroleum is used thus when you throw them away they are completely compostable.
The cutlery converts to soil within 3-6 months in a commercial composting system. I expect it takes a bit longer in home compost.
Tread Softly Notes:
World Centric 24-Piece Cutlery Set found at Target for $2.29.