Add shrimp to a bowl and season with kosher salt and pepper. Add remaining ingredients and toss until shrimp are seasoned throughout. Set aside to marinate for 5 minutes.
Add all chimichurri ingredients to a bowl and mix until well combined. Set aside.
Preheat the grill pan over medium-high heat.
Spray with avocado oil spray and add shrimp. Cook each side for 3 minutes or until plump and cooked through.
Remove shrimp from grill pan and place in a bowl.
Toss half of the chimichurri mixture and add more until your desired amount of sauce is achieved. Serve immediately as an appetizer or with steamed jasmine rice.