Preheat oven to 300°. Wrap a 9x13-inch baking pan with foil.
Make brownie batter as instructed on box with addition of adding an extra egg. Pour into prepared pan. Bake 40 minutes or until a toothpick inserted into the center comes out clean. Cool completely.
Using the foil, lift brownies out of the pan. Cut into rectangles, insert a popsicle stick, place on a cookie sheet lined with parchment paper.
Pour candy melts into a microwave safe bowl and melt (about 1 minute 30 seconds). If the candy is too thick add a little shorting to the bowl and stir until melted and creamy. Spoon some of the candy over the brownie. To get the drizzle effect, spoon some of the melted candy on the top of the brownie, hold it up right so that candy rolls down the brownie giving the illusion that it is melting. Immediately add sprinkles. Place on lined cookie sheet to harden. Depending on the temperature and humidity level you can set them on the counter to harden or place them in the refrigerator.