Mussels in Marinara Sauce

Name: Mussels in Marinara Sauce
Ingredients: 3 tablespoons extra virgin olive oil (plus more for drizzling); 5 garlic cloves (very thinly sliced); 1-2 anchovy fillets (optional); ¼ teaspoon red pepper flakes (optional, to taste); ½ cup dry white wine; 1 28-ounce can whole peeled tomatoes (crushed with your hands or an immersion blender); Kosher salt and pepper (to taste); 2 pounds fresh mussels (scrubbed and debearded); 2 tablespoons unsalted butter; 2 tablespoons chopped flat-leaf parsley or torn basil (or a mix)