Remove the cookies from their packaging, setting aside any that are damaged.
Measure out about ½ cup candy melts into bowls (1 bowl for each color).
Fill each skillet with about 1 inch of water. Set the candy melts bowls into the skillets and turn stove burners to high. Allow water to heat but not boil. You will notice the candy start to melt. Stir the candy until it’s fully melted. Remember to use one spoon for each color to avoid mixing the colors.
Turn down the water to about halfway, or medium heat. You want to keep it warm enough that it stays melted, but not too hot that the candy burns.
Take one cookie at a time. Spoon up some of the melted candy and smooth it over the cookie, add candy on each side as needed. Leave the end part uncovered for holding. (Tip: I noticed the candy is thick so I as I smoothed it, I scraped some off, too. Then the candy wasn’t too thick.)
Lay each cookie on the parchment paper covered cookie sheet. When all cookies are “dipped”, put them in the refrigerator to harden for about 5-10 minutes.
Pour some jimmies into a small dish and set to the side of your work area.
Spoon each melted candy into a pastry bag and cut the very tip of the bag. Press the candy down to the tip. (Careful it can feel hot. You can wear oven gloves or put a towel around the bags.)
Take the cookie sheet from the refrigerator and begin to squeeze the pastry bag to drizzle, left to right, the melted candy freely over the cookies. Use the color opposite from what you coated the cookie with. Stop every 2-4 cookies to sprinkle a pinch of jimmies over the wet drizzled candy.
When all the cookies are decorated, return them to chill in the refrigerator until solid, or about 5-10 minutes