LINE 13 x 9-inch baking pan with plastic wrap or foil with edges hanging over sides.
MIX crumbs and butter in small bowl. Press onto bottom of prepared pan. Sprinkle 1 cup morsels and 1/2 cup pretzels over crumb crust. Scoop ice cream over morsels; spread evenly with knife or small spatula.
SPRINKLE with remaining 2/3 cup morsels and 1/2 cup pretzels; press down lightly. Freeze for at least 2 hours.
TO SERVE: Let stand for 5 minutes. Lift dessert out of pan; remove plastic wrap. Cut into squares. Drizzle each serving with Nesquik.