Baked Cod and Chorizo

Name: Baked Cod and Chorizo
Ingredients: 3 tablespoons olive oil; 6 ounces chorizo or smoked sausage (such as kielbasa) thinly sliced; 1 1/2 lbs. Yukon gold potatoes (peel first if desired), sliced 1/4 inch thick; 3 leeks white and light green parts only — halved lengthwise, rinsed, and thinly sliced into half-moons; 1 cup low-sodium chicken broth; 1/4 teaspoon crumbled saffron threads; 1 1/4 teaspoons kosher salt; 1/4 teaspoon black pepper; 2 1/2 to 3 pounds cod fillets; 1/2 cup fresh flat-leaf parsley leaves roughly chopped