In baking, it matters for the overall salt level in the recipe. A typical stick of salted butter has about 1/4 teaspoon of salt. So if your recipe calls for two sticks (ie a cup) of unsalted butter and one teaspoon of salt, you can use salted butter and reduce the salt to 1/2 a teaspoon. A lot of serious bakers recommend only using unsalted butter so you control exactly how much salt you’re adding.
1 Like