Crust: Mix crushed pretzels butter and sugar in a 9 x 13 baking dish. Bake 8 minutes at 400°. FILLING: Mix cream cheese well with sugar. Fold in cool Whip. Spread on cooled crust. TOP LAYER: Mix strawberry jello with boiling water and frozen strawberries. Let set 10 minutes. Strawberries will thaw. Pour on top of creamed mixture and refrigerate.