In a medium bowl, combine olive oil, red wine vinegar, finely chopped parsley, minced garlic, dried oregano, red pepper flakes, kosher salt, and black pepper.
Stir the mixture well to ensure all ingredients are evenly distributed.
Allow the chimichurri to sit for at least 10 minutes before serving to let the flavors meld together. For best results, let it sit for an hour or more.