
In a large bowl, beat your softened butter with a hand or stand mixer until the butter is smooth and fluffy and light in color. This may take a few minutes. Add the vanilla and mix until combined.
Sift in your powdered sugar and salt, then carefully mix by hand with a spoon or silicone spatula until the powdered sugar is mostly mixed into the butter and no longer loose. This will help avoid a big poof of mess when you turn back on your mixer.
Once it’s mostly mixed in, use your hand or stand mixer to mix the icing until it is completely combined and smooth and silky.
If your icing is a little too thick for your liking, add a little bit of milk 2 tsp at a time until it reaches your desired consistency. I didn’t need any for my icing.
Use to frost your cakes, cookies, or other sweet desserts. Enjoy!