Let the butter soften at room temperature.
Add grated Parmesan cheese, freshly ground black pepper, minced garlic, parsley, salt, and onion powder.
Mix thoroughly until all ingredients are evenly combined.
Transfer the butter to parchment paper and roll into a log, or store it in an airtight container.
Refrigerate for at least 1 hour to firm up.
Slice or melt over steaks, vegetables, pasta, potatoes, seafood, or bread before serving.