Creamy Lemon Squares

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20 Reduced Fat NILLA Wafers, finely crushed (about 3/4 cup)
1/2 cup flour
1/4 cup packed brown sugar
1/4 cup cold margarine
1 pkg. (8 oz.) PHILADELPHIA Neufchatel Cheese, softened
1 cup granulated sugar
2 eggs
2 Tbsp. flour
3 Tbsp. lemon zest, divided
1/4 cup fresh lemon juice
1/4 tsp. CALUMET Baking Powder
2 tsp. powdered sugar

LINE 8-inch square pan with foil. Mix first 3 ingredients in medium bowl. Cut in margarine with pastry blender or 2 knives until mixture resembles coarse crumbs; press onto bottom of prepared pan. Bake 15 min. BEAT Neufchatel and granulated sugar with mixer until blended. Add eggs and 2 Tbsp. flour; mix well. Blend in 1 Tbsp. zest, juice and baking powder; pour over crust. BAKE 25 to 28 min. or until center is set. Cool completely. Refrigerate 2 hours. Sprinkle with powdered sugar and remaining zest just before serving.