In the container of a blender, combine egg yolks, mustard, lemon zest, lemon juice, salt, and paprika. Cover and blend on high speed for about 10 seconds.
With blender on medium-high speed, pour in hot melted butter in a slow, steady stream until incorporated and mixture thickens.
Recipe by Victoria at https://victoriamag.com/smoked-salmon-eggs-benedict-roasted-asparagus/