In a large bowl, beat butter with a mixer at medium-high speed until creamy, 2 to 3 minutes. With mixer on medium-low speed, gradually add confectioners’ sugar, beating just until combined, stopping to scrape sides of bowl. With mixer on medium speed, add molasses and salt, beating until combined, about 1 minute. Use immediately.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/buttermilk-spice-cake-with-molasses-buttercream-recipe/