Baked Cod Puttanesca

Name: Baked Cod Puttanesca
Ingredients: 3 Tablespoons (42ml) olive oil (plus more for drizzling ); 1 small yellow onion (diced ); 2 teaspoons fresh oregano (minced ); 1 2 ounce tin flat anchovies in olive oil (not drained ); 1/2 teaspoon crushed red pepper flakes; 1/2 cup Kalamata olives (pitted and sliced in half vertically ); 1/4 cup capers (drained ); 6 cloves garlic (minced); 1/2 cup (113ml) dry white wine; 1 28 ounce can crushed tomatoes with basil; 1 teaspoon salt (divided, more if needed); 1/2 teaspoon black pepper (divided, more if needed); 1/2 cup fresh basil (roughly chopped ); 5 6 ounces cod filets (skin removed, 32 ounces total ); crusty bread (for serving, optional )