Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the crushed pretzels, melted butter, and granulated sugar until well mixed.
Press the pretzel mixture firmly into the bottom of a 9x13 inch baking dish to form a crust. Bake in the preheated oven for 10 minutes. Remove from the oven and allow to cool.
In another bowl, beat the cream cheese and powdered sugar together until smooth and creamy. Gently fold in the whipped topping until evenly combined.
Spread the cream cheese mixture over the cooled pretzel crust in an even layer.
In a separate bowl, dissolve the strawberry gelatin in 2 cups of boiling water, stirring until fully dissolved. Add the sliced strawberries to the gelatin mixture once it cools slightly.
Gently pour the strawberry mixture over the cream cheese layer.
Refrigerate the entire dish for at least 2 hours, or until the gelatin is fully set. Cut into squares and serve chilled.