Rinse shrimp under cold water thoroughly.
Pat shrimp completely dry with paper towels.
Season shrimp with salt and pepper evenly.
Heat olive oil in large skillet.
Add parsley to food processor first.
Add cilantro and garlic to processor.
Pulse herbs until roughly chopped together.
Add vinegar and red pepper flakes.
Slowly drizzle olive oil while processing.
Season chimichurri with salt to taste.
Cook shrimp 2-3 minutes per side.
Shrimp should turn pink and opaque.
Remove shrimp from heat immediately.
Serve shrimp topped with fresh chimichurri.