So Simple!  Delicious on Steaks and Lamb Chops.  
Melt a 4 oz. package of Bearnaise Compound Butter in a glass measining cup in the microwave until boiling.  Place 4 medium or 3 large egg yolks in a regular drink blender.  Through the top, slowly add the hot butter while blending on low.  That's it!  You're finished.  Enjoy!  4oz. package.