In the bowl of your stand mixer fitted with the paddle attachment, place 3 cups of the flour, xanthan gum, cream of tartar, sugar and yeast, and whisk with a separate handheld whisk to combine well. (glutenfreeonashoestring.com)
Just beat some heavy cream, confectioner's sugar, and vanilla until soft peaks form, and then use a handheld whisk to incorporate the sour cream until you achieve stiff peaks. (e2bakesbrooklyn.com)