Seared Cod with Potato and Chorizo Hobo Packs

Name: Seared Cod with Potato and Chorizo Hobo Packs
Ingredients: 2 tablespoons chopped salted, roasted pumpkin seeds (pepitas); 1 tablespoon chopped fresh chives; ½ teaspoon finely grated lime zest; 1 tablespoon fresh lime juice; 4 tablespoons (½ stick) unsalted butter, room temperature; Kosher salt and freshly ground black pepper; 1½ pounds fingerling potatoes; 2 ounces dried Spanish chorizo, casings removed, chopped; 2 tablespoons olive oil; 2 tablespoons vegetable oil; 4 6-ounce skinless cod fillets