The Egg Cream has neither egg nor cream in it. But it does have chocolate, and in my version,Vanilla Cream Soda!
Take a large glass
fill it with Chocolate Syrup (about 2 TBLSP)
and about halfway up with milk
Then fill to the top with Vanilla Cream Soda
the usual recipes say soda/seltzer water, I choose Cream Soda to get the vanilla flavor.