In a medium bowl, combine olive oil, minced garlic, dried oregano, red pepper flakes (if using), and black pepper.
Add the cubed Parmesan cheese to the marinade and toss gently to coat evenly.
Transfer the marinated Parmesan cheese and the marinade to a clean jar or airtight container.
Refrigerate for at least 30 minutes, or preferably for a few hours, to allow the flavors to meld. The longer it marinates, the more flavorful it will be.
Serve chilled or at room temperature. It's delicious on its own, with crackers, or added to salads and pasta dishes.
Notes
The marinated parmesan cheese can be stored in the refrigerator for up to 2 weeks. The marinade can be reused for marinating more cheese or used as a dressing.