To a large mixing bowl, run 1 1/2 cups of the powdered sugar through a sieve. Add the corn syrup, egg white, 2 1/2 tsp cold water and vanilla extract. Use an electric hand mixer to beat until smooth. If you’re making the egg free version leave the egg whiteout and use 2 1/2 tbsp of cold water instead.
Add the remaining powdered sugar (sifted). Use a spatula to mix until smooth but thick.
Split the mixture into as many small mixing bowls as you like depending on how, many colors you’re making. Add the desired amount of food gel colorings. I reckon starting off with just one drop and then mix before adding more. You can go darker but not lighter! Add to a piping bag, snip a small bit off the end. Pipe into a baking tray lined with baking paper. Allow to set overnight before using a knife or bench scraper to cut down to sprinkle sized strips!
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Notes
StorageSprinkles can be stored in an airtight container for up to a month. If you’re using egg whites, up to a week in the fridge.Vanilla extractDon't be tempted to add more vanilla extract for a stronger flavor as it will discolour the sprinkles. instead use a really good quality vanilla extract. A little goes a long way and you'll end up with brightly coloured sprinkles.