Materials I used:
Porcelain plate
Craft enamel paint - red and green
sponge brush
disposable paint or tray
oven for baking
I found paint at Michaels, they've got several brands but just make sure it is an enamel paint, not just the regular craft paint. I used Folk Art brand. If you've got the right kind, it will have baking instructions on the back. I found 2 Villeroy & Bosch plates at Marshalls that didn't have any lip, so they were perfect.
You can just stick your kids hand directly in the paint, but I've found other blogs that recommend using a brush for a cleaner result with handprint crafts. One coverage is good for 2 or 3 handprints. Now, this paint dries fast, so if you mess up wash it off immediately using a wet papertowel. The upside to this is you can also just redo a partial handprint without worrying about smearing the completed part. At Colton's age, I controlled the hand placement entirely and rotated the plate while I "stamped" his hand on it. I followed the baking instructions on the paint and they turned out nicely.