Preheat grill or grill pan to medium - high heat. Season chicken breasts with salt and freshly ground pepper. Grill chicken approx 5 minutes per side until cooked through. Remove from heat and allow to rest about 5 minutes.
Slice chicken breasts at an angle for serving.
For the Chimichurri Sauce:
Combine all ingredients in a bowl, or pulse all ingredients in a food processor. Be careful not to over mix.
Drizzle chicken with chumichurri sauce prior to serving.
Recipe by Good Thyme Kitchen at https://www.goodthymekitchen.com/grilled-chicken-chimichurri-sauce/