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Roast the chiles: There are lots of ways to do this (see How to Roast Green Chiles over an Open Flame), I tend to just put them either directly on the flame, or in one of those grill pans with holes in them, over the gas flame.You can roast them on a grill or under a broiler. Just make sure they get blackened all over. Then put them in a bowl, cover the bowl and let them steam.When they've cooled down enough to touch, use your fingers or a dampened paper towel to strip off the charred bits.Cut them open, remove and discard the stem, seed pod and inside veins. Roughly chop the chiles and set aside.
Soften the onions and celery: Melt butter in a 5 to 6 quart heavy-bottomed pot on medium high heat. Once the butter is melted, add the onions and the celery, stir to coat with the butter. Cook for 8 to 10 minutes, lowering the heat to medium, until the onions and celery are softened and are beginning to brown.
Prepare corn: While the onions are cooking, if using fresh corn on the cob, cut the fresh kernels of corn away from the cobs.
Add potatoes, stock, spices: Once the onions and celery are beginning to brown, add the garlic and cook for a minute more. Add the potatoes and the stock to the pot. Add the bay leaves, cumin, oregano, and salt. Increase heat and bring to a simmer. Lower heat to maintain a simmer and cook for 8-10 minutes until the potatoes are just cooked through.
Add corn, then poblanos: Add the corn kernels to the pot and cook for 4 to 5 minutes, until cooked through. Add the chopped roasted poblanos to the pot.
Add cream: Remove the bay leaves. Stir in the cream. Add black pepper, more or less to taste. At this point, if you want a thicker base for your chowder, you can use an immersion blender or standup blender to purée about a third of the soup. To serve, sprinkle with a little fresh lime juice and serve with a slice or two of lime.