Preheat your oven to 400 degrees Fahrenheit.
In a large bowl, stir the pretzels, melted butter, and sugar together until well combined.
2 cups crushed pretzels, 3/4 cup unsalted butter, 3 tablespoons granulated sugar
Press into the bottom of a 9 by 13 inch baking dish using the bottom of a drinking glass or a measuring cup. Bake for 8 minutes. Remove from the oven and allow to fully cool.
In a large bowl with a hand mixer or in the bowl of a stand mixer fitted with the paddle attachment, beat the sugar and cream cheese together until smooth. Gently fold in the whipped topping (see Note 2).
8 ounces cream cheese, 1 cup granulated sugar, 8 ounces whipped topping
Carefully spread the cream cheese mixture over the cooled pretzel crust. Spread the mixture all the way to the edges of the baking dish. This will prevent the next layer from leaking around it. Refrigerate for 45 minutes.
Combine the Jell-O and the boiling water in a medium-sized bowl until the Jell-O is dissolved completely. Stir in the frozen strawberries. Pour over the chilled cream cheese layer. Refrigerate for 2 hours before slicing and enjoying.
6 ounces strawberry flavored Jell-O, 2 cups boiling water, 20 ounces frozen sliced strawberries