Frosty Orange Dream Squares

40 NILLA Wafers, finely crushed (about 1-1/2 cups)
1/4 cup (1/2 stick) butter, melted
2 cups cold milk
2 pkg. (4-serving size each) JELL-O Vanilla Flavor Instant Pudding & Pie Filling
1 tub (8 oz.) COOL WHIP Whipped Topping, thawed, divided
2 cups orange sherbet, softened

LINE 13x9-inch pan with foil, with ends of foil extending over sides of pan. Mix wafer crumbs and butter. Press firmly onto bottom of prepared pan; set aside until ready to use.
ADD milk to dry pudding mixes in medium bowl. Beat with wire whisk 2 min. or until well blended. Gently stir in half of the whipped topping. Spoon evenly over crust. Refrigerate 10 min. Add remaining whipped topping to sherbet; stir with wire whisk until well blended. Spoon evenly over pudding layer; cover.
FREEZE at least 3 hours or overnight. Use foil handles to remove dessert from pan before cutting into squares to serve. Store leftover dessert in freezer.

Substitute
Prepare as directed, using lemon or lime sherbet.