Wash grapes and skewer 2 grapes onto a stick. Place on a flat surface and stick into the freezer until frozen, which usually takes about an hour.
Once grapes are frozen, stick a big glob of peanut butter into a tall skinny vessel (Like a juice cup or a 4 oz ball jar) and warm to a liquid constancy in the microwave (about 30-45 seconds) or if you don't have a microwave, stick in a sauce pan, warm on stove, and pour into a glass (what I do)
Remove frozen grapes from freezer and dip into melted peanut butter. Place on a wax paper line tray or pan and sprinkle with cinnamon and or cocoa powder, or not, or a few (whatever you want) and stick back into freezer for another 10 minutes.