To make the chimichurri sauce, combine parsley, cilantro, shallot, jalapeno, garlic, oregano, red pepper flakes, red wine vinegar and lime juice in the bowl of a food processor; season with salt and pepper, to taste. With the motor running, add olive oil in a slow stream until emulsified; set aside.
Preheat oven to 400 degrees F. Lightly oil a baking sheet or coat with nonstick spray.
Place shrimp in a single layer onto the prepared baking sheet. Add olive oil and garlic; season with salt and pepper, to taste. Gently toss to combine.
Place into oven and roast just until pink, firm and cooked through, about 6-8 minutes.