Place potatoes in 4-quart saucepan. Add water and
salt. Cover; bring to a boil over high heat (7 to 10 minutes.) Reduce
heat to medium. Cook until potatoes are fork tender (15 to 18 minutes).
Drain. Keep warm.
Meanwhile, combine onions and 1 cup broth in 10-inch nonstick skillet.
Cook over medium heat, stirring occasionally, until onions are softened
and broth is absorbed (15 to 18 minutes).
Increase heat to medium-high; add 2 tablespoons light butter. Cook until
onions are browned (6 to 8 minutes).
Place hot potatoes in large mixer bowl; mash slightly with fork. Beat
at medium speed, adding remaining light butter, 1 tablespoon at a time,
and mixing well after each addition. Add cooked onions, remaining broth,
light sour cream and pepper. Continue beating until well mixed. DO NOT
OVERBEAT. Serve immediately.
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