On a large cutting board, finely chop the parsley and fresh oregano. Be sure they are bone dry for the best way to chop.
In a medium bowl, add the chopped parsley and oregano, minced garlic, minced shallot, dried oregano, crushed red pepper flakes or diced chili pepper, and salt. Stir to combine.
Add the red wine vinegar and stir to combine. While stirring, slowly drizzle in the olive oil. Taste and adjust seasonings to taste.
Notes
Storage: Transfer leftover chimichurri sauce to an airtight container or glass jar and refrigerate for up to 1 week.