In a small bowl, combine the cream cheese, onion and garlic, Transfer to a serving plate; shape into a 6-in. disk. Set aside.
In a small saucepan, combine the butter, brown sugar, Worcestershire sauce and mustard. Cook and stir over medium heat for 4-5 minutes or until sugar is dissolved. Remove from the heat; stir in pecans.
Cool slightly. Spoon over cheese mixture. Serve with crackers.