Put butter and confectioners' sugar in the bowl of an electric mixer fitted with the paddle attachment. Mix on low speed until combined, about 2 minutes. Add egg yolks, and mix until combined, about 1 minute. Add 3/4 cup flour, and mix just until flour is incorporated. Add remaining 3/4 cup flour, the salt, and cream; mix until just combined, about 1 minute.
Shape dough into a disk; wrap in plastic, and refrigerate 2 hours or overnight.