So, what makes evaporated milk so special? Well, it's basically regular milk that's been heated until about 60% of its water content has evaporated, leaving behind a creamy, concentrated milk. This process gives evaporated milk its unique characteristics, which can be a game-changer in certain recipes, like mac and cheese or cream soups.
Now, you might be thinking, "But, what's the big deal? Can't I just use regular milk and call it a day?" And, to a certain extent, you can. However, using regular milk might result in a slightly watery or less rich final product. It's kind of like trying to make a milkshake with skim milk instead of whole milk - it just won't be the same.
That being said, there are some instances where using regular milk instead of evaporated milk won't make a huge difference. For example, if you're making a smoothie or a pancake recipe, the difference will be minimal. But, if you're making a bechamel sauce or a creamy dessert, using evaporated milk can make all the difference.
Can Substitute Evaporated Milk For Whole Milk at Anna Steven blog