Preheat your oven to 350 degrees.
In a medium bowl, combine crushed pretzels, butter, and granulated sugar. Toss everything together until well-coated.
Press this mixture into an un-greased 9-inch by 13-inch baking dish. Bake for 10 minutes until lightly golden.
Allow to cool completely to room temperature.
In another medium bowl, beat together cream cheese and granulated sugar until smooth.
Gently fold in whipped topping until combined.
Spread this cream cheese layer over the crust and refrigerate until set.
Dissolve raspberry gelatin in boiling water, stirring until fully dissolved.
Stir in frozen raspberries and let chill until partially set.
Pour the raspberry mixture over the cream cheese layer and chill until firm.
Garnish with whipped topping and crushed pretzels before serving.
