In 12-inch skillet, cook bacon until crisp; drain on paper towels. Reserve 1 tablespoon drippings in skillet. Add margarine to drippings in skillet; heat over medium-high heat until margarine is melted.
Stir in hot water, milk, sauce mix and uncooked pasta (from Chicken Helper box). Heat to boiling, stirring occasionally.
Reduce heat. Cover; simmer 6 minutes, stirring occasionally. Stir in chicken and frozen peas. Cover; simmer 4 to 6 minutes longer or until pasta is tender. Remove from heat; uncover, and stir in bacon (sauce will thicken as it stands).