Prepare as directed, using lime juice and grated lime peel.
To line 13x9-inch pan with foil, turn pan upside down. Mold sheet of foil over inverted pan. Remove foil; flip pan over and drop foil inside. Bake as directed. When Creamy Lemon Nut Bars are cool, lift by foil from pan onto cutting board. Fold back edges of foil and cut.