Preheat oven to 350. In large bowl, combine all crust ingredients. Using a hand held or stand mixer, mix at low speed until crumbly. Press mixture evenly in bottom of a 13x9-inch pan. Bake at 350 for 20-30 minutes or until light golden brown.
Meanwhile, in large bowl combine all filling ingredients except lemon juice; blend well. Stir in 1/4 cup lemon juice. Pour mixture over warm crust.
Return to oven and bake an additional 25 to 30 minutes or until top is light golden brown. Cool completely.
In small bowl, combine 2 cups powdered sugar and enough lemon juice for desired spreading consistency; blend until smooth. Spread over cooled bars. Cut into bars.