In a bowl, combine crushed pretzels, melted butter, and granulated sugar. Press mixture evenly into the bottom of a 9×13 inch baking dish.
Bake for 8-10 minutes. Let cool completely.
In a separate bowl, beat softened cream cheese and powdered sugar until smooth. Fold in whipped topping. Spread this mixture evenly over the cooled pretzel crust.
In a bowl, dissolve strawberry gelatin in boiling water. Stir in cold water and thawed strawberries. Refrigerate until slightly thickened, about 30-45 minutes.
Spoon the thickened gelatin mixture over the cream cheese layer.
Refrigerate for at least 4 hours, or until firm.
Notes
For a firmer Jell-O layer, you can reduce the cold water slightly.
Make this dessert the day before your event for best results.