03. Combine sugar and milk powder; set aside. Whisk together cornstarch and a splash of milk; set aside.Bring remaining milk, cream, corn syrup, and salt to a boil. Whisk in milk powder/ sugar mixture and boil for 2 minutes.
04. Whisk in cornstarch slurry and simmer until thickened, about 3 minutes. Pour into a large bowl and mix in torn mint leaves.
05. Cover with plastic wrap and chill overnight. Strain into a clean bowl. Mix in peppermint oil and food coloring, if using.