Heat oil in large skillet over medium-high heat until hot. Add onion; cook and stir 1 minute. Add frozen sauce from meal starter, water, peanut butter and 1 teaspoon of the seasoning from soup mix; discard remaining seasoning. Cook 2 to 3 minutes or until sauce is thawed, stirring occasionally.
Break up noodles from soup mix. Add noodles and frozen vegetables to skillet; cover and cook 8 to 10 minutes or until vegetables are crisp-tender, stirring occasionally.
Add beef; cook and stir until thoroughly heated. Spoon mixture into individual serving bowls. Sprinkle each with peanuts.