Bring potatoes to a boil in a large saucepan of water. Cover, reduce heat to a simmer and cook until potatoes are tender, about 5 min. Drain and return potatoes to saucepan. Stir in milk, soup, bay leaf, corn and clams, if using. Simmer over medium heat until chowder is warmed through, 7 min. Stir in green onion, dill, salt and pepper.
Omit the can of baby clams to make this dish vegetarian-friendly.