In the bowl of a stand mixer fitted with the paddle attachment, beat butter and salt at low speed until smooth. Slowly add confectioners’ sugar, about 1 cup (120 grams) at a time, alternately with preserves and cream, about 2 tablespoons at a time, beating until smooth after each addition. Increase mixer speed to medium, and beat until smooth and fluffy, 1 to 2 minutes. Beat in vanilla.
Recipe by Bake from Scratch at https://staging.bakefromscratch.com/march-vanilla-bean-macarons-strawberry-buttercream/