Swiss Buttercream: from Smitten Kitchen. Pinner - "so I met this girl at a party last night who makes cupcakes from her home as a side job - yay cottage food law! - anyway, she had this frosting that was uhmazing, just like the icing my granny used to smear all over her red velvet cake. the girl revealed to me its called swiss buttercream - yippee! no more cream cheese or sugary buttercream for me!!!!"