If you ever head up North on HWY 400, stop by Yanni's Family Restaurant. It is on County Road 16. NOTE: HWY 12 turns into County Road 16 after passing Coldwater and then back to HWY 12 when you pass Waubaushene (See Map). Yanni's is a little hidden gem run by a Greek family. We went for lunch after visiting Sainte Marie Among the Hurons. Lunch was pretty good, will definitely try dinner next time!
Unfortunately, Yanni's does not seem to have any sort of online presence at this time of writing.