Although sweet potatoes can be baked or boiled, steaming is faster, easier, and won’t wash away any flavor. In this case, the sweetness is balanced by the smoky heat of the chipotle chiles.
Put the sweet potatoes in a steamer basket and place in a large pot of simmering water. The water should be 1 inch below the bottom of the basket. Cover and steam over medium-high heat until the sweet potatoes are fork-tender, about 20 minutes.
Remove the steamer basket, pour out the water, and dump the sweet potatoes back into the pot. Add the butter and salt and mash with a potato masher. Add the chile and sauce and continue mashing to combine. Serve immediately.
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