Best Baked Mediterranean Cod Recipe

Name: Best Baked Mediterranean Cod Recipe
Ingredients: 1 ½ pounds cod fillet (approximately 4-5 fillets); ½ medium red onion (or one large shallot, sliced); 2 cloves garlic (minced); 1 pound cherry tomatoes (halved); ½ cup Kalamata olives; ½ cup green Castelvetrano olives (more if desired); 1 tablespoon capers (optional); 5 tablespoons olive oil (divided); Zest of 1 large lemon; 1 pinch red pepper flakes; Salt and pepper to taste; ½ cup white wine (or water); Fresh basil (chopped for garnish); Fresh parsley (chopped for garnish); Optional: lemon slices- one slice per fillet