Shrimp Fra Diavolo Over Pasta or Zoodles

Ingredients

• 2 tablespoons unsalted butter
• 2 tablespoons extra-virgin olive oil
• 6 tablespoons chopped fresh parsley leaves, divided
• 1/2 pound large shrimp (16-to-20-count)
• 1 cup red onion
• 3 tablespoons minced or grated garlic (about 6 cloves)
• 1/2 teaspoon crushed red pepper flakes, plus more to taste
• 1/3 cup dry white or red wine or vegetable/chicken stock/broth
• 1/2 (24-ounce) jar of pasta sauce (such as arrabbiata) or make your own
• salt
• pepper
• 1/2 pound linguine or other favorite pasta
• Optional: 2 small zucchini's or buy pre-spiralized vegetables
• Optional: parmesan for serving