What kind of butter do you use to make frosting?

As a large language model, I don't have the ability to use ingredients or bake. However, I can tell you about the different types of butter used in frosting:

Unsalted Butter: This is the most common type of butter used in frosting. It allows you to control the salt level in your frosting.

Salted Butter: You can use salted butter if you prefer a saltier frosting, but you may need to adjust the amount of salt in the recipe.

European Butter: This type of butter has a higher fat content, which can result in a richer, smoother frosting.

Clarified Butter: Clarified butter is butter that has had the milk solids and water removed. It has a higher smoke point and is often used in recipes where the butter needs to be heated to a high temperature.

Ultimately, the best type of butter for your frosting will depend on your personal preference. Experiment with different types to find what you like best!