In a mixing bowl, combine softened butter, fresh basil pesto, grated Parmesan cheese, and minced garlic (if using). Mix until smooth and well incorporated.

Transfer the pesto butter mixture onto plastic wrap and shape it into a log.

Twist the ends of the plastic wrap to secure the log and chill in the refrigerator for 1-2 hours or in the freezer for 45-60 minutes.

Once chilled, slice the log into disks and store in an airtight container or ziplock bag.