Hi SomeCurryFan. I've never used evaporated milk in a naan and I'm not sure it's mentioned anywhere I've seen. Milk and buttermilk, yes, but not evaporated although it is a possibility and may be worth investigation. The other dairy product commonly used is yogurt or curd, which is hardly a secret. Then of course you have the addition or not of egg, the use of yeast or not. Self raising V plain flour and the use or not of Baking Powder.