In a small bowl, combine the flour, walnuts and brown sugar blend; cut in butter until crumbly.
Set aside 2/3 cup for topping; press remaining crumb mixture into an 8-in.
square baking dish coated with cooking spray.
Bake at 350 for 9-11 minutes or until lightly browned.
Meanwhile, in a small bowl, beat the cream cheeses, sugar and flour until light and fluffy.
Beat in the egg substitute, milk, lemon juice and vanilla just until blended.
Pour over crust; sprinkle with reserved crumb mixture.
Bake for 12-15 minutes or until filling is set.
Cool on a wire rack for 1 hour.
Refrigerate for at least 2 hours.
Cut into bars.
Refrigerate leftovers.