Preheat the oven to 350°F (175°C).
In a mixing bowl, combine crushed pretzels, melted butter, and granulated sugar. Mix well.
Press the pretzel mixture firmly into the bottom of a 9x13 inch baking dish to form a crust. Bake for 10 minutes, then remove and let cool completely.
In a separate bowl, beat the softened cream cheese and powdered sugar until smooth. Fold in the whipped topping until well combined.
Spread the cream cheese mixture evenly over the cooled pretzel crust.
In a saucepan, combine the strawberry jello powder with 2 cups of boiling water. Stir well until the jello powder is completely dissolved.
Allow the jello mixture to cool slightly, then add in the sliced strawberries.
Pour the strawberry jello mixture over the cream cheese layer in the baking dish. Refrigerate for at least 2 hours or until set.
Once set, slice into squares and serve chilled.