A recipe I got from folks here is based on potatoes, onion and fish.
I like some more vegetables in my chowder and added carrots and celery, (and/or leeks).
That's more like the Norwegian "Bergen's Fiskesuppe" (fish soup from Bergen).
Ingredients: (for 4 pers)
1 pound white fish (cod, haddock, hake, etc.), cubed
2 chopped medium onions
tiny bit of chopped garlic (or more if desired)
4 cubed potatoes
milk or light cream
2 bay leaves
fresh thyme (used dried)
a few black peppercorns (used ground black pepper)
corn starch for thickening
1 carrot, diced
1 celery, diced
1/2 cup bacon, bits