Preheat your grill to medium-high (375-450°F). Combine all of the chimichurri ingredients together in a bowl. Let the chimichurri sit for a few minutes to let the flavors combine.
½ cup olive oil, 2 tablespoons red wine vinegar, ¾ cup chopped flat-leaf parsley, 4 cloves garlic, 1 red chili pepper, 1 teaspoon dried oregano, 1 teaspoon kosher salt, ¼ teaspoon ground black pepper
Combine the cumin, onion powder, garlic powder, salt, and pepper in a small bowl. Rub the chicken breasts with olive oil and the seasoning mix.
½ teaspoon ground cumin, ½ teaspoon onion powder, ¼ teaspoon garlic powder, ½ teaspoon kosher salt, ¼ teaspoon ground black pepper
Grill the chicken breasts for 10-15 minutes, flipping halfway through.