In a large dutch oven or stock pot, heat 2 tablespoons of olive oil over medium to medium low heat.
Add the diced sausage to the pot and saute until browned. We're just browning for flavor at this point, the sausage is already cooked fully.
Without removing the sausage, add the onions and celery and cook until the veggies are softened.
Add the dried thyme and stir for about 30 seconds until the mixture is fragrant.
Sprinkle the flour over the sausage and veggie mixture. Stir to coat and cook for one minute. This will cook out the raw flour flavor.
Add the potatoes and chicken stock. Give the mix a stir, making sure to scrape up all the brown bits on the bottom of the pot.
Bring the mixture to a simmer and cook until the potatoes tender, about 15-20 minutes.
Pour in the creamed corn, drained corn, and milk.
Stir and let cook until the corn is heated through.
Give the chowder a taste and add salt and pepper if necessary.