How-to Prepare & Freeze Compound Butter
Place butter on a square of parchment paper, mounding butter into a rough log shape.
Fold paper toward you, enclosing the butter. Press butter with a ruler to form a log, holding the edges of paper securely with the other hand. Twist edges to seal. Wrap butter in plastic and freeze. Slice off the desired portions when ready to use, then rewrap the butter and return it to the freezer.
You can also freeze scoops or rosettes of flavored butter on a parchment paper-lined baking sheet. Once frozen, arrange the butter portions on layers of paper in a freezer container. Remove the desired number of portions from the freezer when needed.