Make the cold foam: Add all the cold foam ingredients to a small mason jar or glass. Froth with a milk frother for 20-30 seconds until fully whipped. Set aside.
Make Elphaba's Green Elixir: Add ice to a tall glass, then pour in the peppermint syrup, vanilla syrup, and cold brew. Stir.
Top the cold brew with the non-dairy matcha cold foam, then top with pink & green sprinkles if desired. Drink up!