In a large bowl, beat butter and salt with a mixer at medium speed until creamy, about 1 minute, stopping to scrape down sides of bowl. With mixer at low speed, gradually add confectioners’ sugar to butter mixture, alternately with buttermilk, beginning and ending with confectioners’ sugar, beating just until combined. Beat in vanilla bean paste until smooth. Increase speed to medium; beat until fluffy, about 2 minutes. Use immediately.
Recipe by Victoria at https://victoriamag.com/mini-orange-marmalade-cakes-recipe/