Substitute roasted red bell peppers for the poblano peppers
Omit the broth and use 1/2 cup of the reserved spaghetti cooking water to make the cream cheese sauce instead.
How to Roast Peppers
Heat broiler. Place whole bell peppers or large chile peppers on foil-covered baking sheet. Broil, 4 inches from heat, 7 to 10 min. or until peppers are evenly blackened, turning occasionally. Place in paper bag; close bag. Let stand 20 min. or until peppers are cooled. Remove peppers from bag. Peel away blackened skins with small knife; discard skins. Cut peppers lengthwise in half; remove and discard seeds. Use roasted peppers as directed in recipe.