Heat the butter and oil in a large pot. Add the onion and celery and sauté over medium high heat for about 7 minutes, before adding the flour.
Stir vigorously so that the flour cooks, but doesn’t brown, for about 4 minutes. Begin adding the stock a little at a time, while continuing to stir until all the liquid has been added.
Then add the milk and stir well. Next, add the diced potatoes and 1 teaspoon of salt, and allow to simmer for about 8 minutes, stirring often, before adding the corn.
Simmer for an additional 8 to 10 minutes or until the potatoes are cooked.
Now for the trick to thicken and improve the overall flavor of this chowder: puree about a cup or so and return to the pot.
Taste, adding salt if necessary and some black pepper. Serve hot.
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