Mash softened butter in a mixing bowl.
Add minced garlic and mix well.
Incorporate chopped parsley into the mixture.
Season with salt and black pepper.
Add lemon juice for a zesty flavor, if desired.
Mix in red pepper flakes for heat, if using.
Ensure all ingredients are well combined.
Transfer to a serving dish or container.
Refrigerate for at least 30 minutes to solidify.
Serve as desired.