Preheat oven to 350°F.
Melt margarine over medium heat in a 2-quart saucepan.
Add green onions; cook, stirring, 2 minutes. Stir in corn starch, cumin and salt. Gradually stir in chicken broth until smooth.
Bring to boil over medium heat, stirring constantly, and boil 1 minute. Remove from heat.
Stir in cheese until melted. Stir in sour cream. Pour over pasta; stir to coat. Spoon into shallow 2-quart baking dish.
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