Preheat oven to 350F. Mix together crushed pretzels, melted butter and sugar. Press into bottom of 13x9-inch pan. Bake for 8 to 10 minutes; cool.
Cream together cream cheese, powdered sugar and half of cool whip. Spread ontop of cooled pretzel crust.
Mix boiling water with gelatin until dissolved. Add frozen strawberries, allow to set for a few minutes, until kind of firm. Spread over cream cheese layer. Refrigerate 30-45 minutes until set. Top with remaining cool whip. Cut into bar pieces and serve.