Meanwhile, in same large bowl, stir together filling ingredients except lemon juice. Stir in lemon juice. Pour mixture over warm crust.
Bake 25 to 30 minutes longer or until top is light golden brown. Cool completely, about 1 hour. Sprinkle with powdered sugar. For bars, cut into 6 rows by 6 rows.
To dress up the desert, use a bit of fresh mint after dusting with powdered sugar.