Add the water and sugar in a small pot and bring to a boil. Reduce heat to low and sift in the cocoa powder.
¾ cup water, 1½ cups granulated sugar, ¾ cup Dutch-process cocoa powder
Then whisk in the vanilla, salt, and corn syrup and continue to cook for about 10 minutes, whisking often, until it starts to thicken. Remove from heat and strain through a fine mesh sieve to remove any clumps. Allow it to cool before using.
Stir together ¼ cup of cooled chocolate syrup and milk until fully combined.
¼ cup chocolate syrup, 1 cup whole milk
Notes
How Many Glasses Of Chocolate Milk Does This Recipe Make? This homemade chocolate milk recipe yields one serving. However, the chocolate syrup recipe yields 2 cups of homemade syrup. Therefore, you can make 8 cups of chocolate milk with one batch of syrup.
What's The Best Way To Store Leftover Chocolate Syrup? Store any leftover chocolate syrup in a tightly sealed container or jar with a lid. Keep the syrup in the fridge to enjoy for up to 2 weeks.
Can I Make This Chocolate Milk Recipe With Non-Dairy Milk? Yes, you should be able to make this recipe with non-dairy milk such as soy milk, coconut milk, or almond milk just fine.