Cook noodles according to package directions, adding 1 tbsp salt to the water, drain and set aside
Place the poblano peppers on a baking sheet and broil until charred on all sides
Seal the peppers in a paper bag for 10 minutes
While the peppers are resting, to a saucepan add the cheese, the heavy cream, the pureed chipotle peppers in adobo sauce, the garlic powder, and 1/2 tsp salt
Cook over low medium heat, stirring occasionally until the cheese is melted
Peel off the outer skin of the poblano peppers, remove the seeds, chop them into small pieces, and stir them into the cheese sauce
Stir the cooked and drained pasta into the cheese sauce and keep warm on low heat