Divide the paste into as many portions as you have colors, tinting each batch with the color of your choice. After the time has elapsed, use a bench scraper or knife to scrape off the dried sprinkle lines and then to break/chop the lines into fairly long pieces for "jimmies" or quite short for "hundreds and thousands". These make the perfect finishing touch for a 100% homemade Pop Tart. I like grocery store sprinkles just fine, or maybe some from fancy flours if I need something . 8 ounces powdered sugar 1/2 tsp kosher salt 1 egg white 1 tsp vanilla, or other extract assorted food colorings as many piping bags as you have colors, fitted with small or multi-opening tips With a hand or stand mixer fitted with a paddle attachment, mix the first four ingredients until a semi-thick paste forms.