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Preheat a large, heavy saucepan over medium heat for about 1 minute.
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Spray it twice with the vegetable oil.
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Saute the onion for about 5 minutes, until translucent.
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Add 4 cups of corn and saute for 4-5 minutes, until it softens a bit.
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Add 2 cups of chicken stock and cook until the corn can be mashed easily with a fork, about 20 minutes.
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Transfer the contents of the pan to a blender and puree until smooth.
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Return the puree to the saucepan over medium-low heat.
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Add the bell pepper, rosemary, thyme, black pepper, cayenne pepper, and the remaining 1 cup chicken stock and 2 cups corn.
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Stir and cook for about 10 minutes more, until the chowder is thick and creamy.
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Garnish with the chopped basil.