In the bowl of a stand mixer fitted with the paddle attachment, beat browned butter and salt at medium speed until creamy, 30 seconds to 1 minute; scrape sides of bowl.

In a small bowl, whisk together whiskey and cream.

With mixer on low speed, gradually add confectioners’ sugar to butter mixture alternately with whiskey mixture, beginning and ending with confectioners’ sugar, beating just until combined after each addition and stopping to scrape sides of bowl. Increase mixer speed to medium, and beat until fluffy, about 2 minutes, stopping to scrape sides of bowl. Use immediately.