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1
Bring a medium (6- to 8-quart) pot of water to a boil; salt it generously; stir in the pasta and cook according to package directions; drain(do not rinse, or you'll rinse away starches that will help thicken the sauce) and return to the empty pot.
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2
Meanwhile, place a large (12- to 14-inch) saute pan over med-high heat for several minutes.
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3
When hot, add the butter or oil, onions, bell peppers, and jalapenos; saute until they begin to soften, about 5 minutes.
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4
Add the heavy cream; bring to a boil, then lower the heat to medium and simmer until the cream is reduced slightly, about 3 minutes.
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5
Add in the cheese and chicken; stir well and cook over med-high heat until the cheese has melted and the mixture thickens, about 3 minutes.
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6
Season with salt and pepper.
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7
Stir the sauce into the cooked and drained pasta in the pot; place over medium heat and simmer for 1-2 minutes to thicken the sauce and allow the pasta to absorb the flavors, stirring now and again; if too thick, add a little more cream.
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8
To make the garnish--in a small bowl, mix together the sour cream and minced chipotle.
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9
Serve the macaroni and cheese in individual bowls topped with a dollop of the chipotle sour cream and a sprinkle of sliced scallions.
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10
**Alternative--if you like the smoky-spicy flavor of the spices but want to avoid the extra fat in the sour cream garnish, just add a teaspoon of the sauce from the canned chipotles in adobo to the macaroni and cheese itself and skip the garnish altogether.
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11
**OR, can use chipotle chile powder, New Mexico chile powder, or regular chile powder, to taste, instead of the canned chipotles.