Whisk the Jell-O mix with boiling water until completely dissolved. Cool to room temperature.
Preheat the oven to 350°F.
Combine the crushed pretzels with melted butter and sugar.
Press the pretzel mixture into the bottom of a baking dish, creating an even layer.
Bake the pretzel crust for 10 minutes. Cool completely.
Beat the cream cheese and sugar for 2 minutes, or until smooth and fluffy.
Gently fold the heavy whipping cream into the cream cheese mixture until completely incorporated.
Spread the cream cheese mixture evenly over the pretzel crust, making sure to reach the edges to seal it and keep the jello from seeping through.
Cover with plastic wrap and refrigerate for 30 minutes to firm up.
Arrange the sliced strawberries over the chilled cream cheese layer.
Pour the Jell-O mixture on top, covering the strawberries.
Cover the strawberry jello salad with plastic wrap and refrigerate for 2 to 4 hours before cutting. You can also garnish the slices with whipped topping before serving. Enjoy!