Sharpie markers (must be Sharpie)
I had my little one draw a picture and write his name. The only guidance he needed was a reminder not to place his hand on the tile or it would smear his work.
After baking in the oven, I checked to make sure that it was set it by running my finger gently over it. It turned out great. I only had a bit of it smear off in one area but I think it was perhaps because the tile was not clean as well as I had thought.
We had an instant Father's Day gift in minutes which is perfect since I am busy assessing.
Happy Teaching and Learning!