Preheat oven to 400.
In a medium bowl, mix together crushed pretzels, butter, and 3 tbs sugar. Press into a lightly greased 9X13-inch pan. Bake for 8 minutes and cool completely.
Use an electric mixer to beat cream cheese and 1 cup sugar until smooth. Fold in whipped topping using a rubber spatula. Spread over cooled pretzel crust, making sure cream cheese mixture completely covers and seals in the crust.
Refrigerate for at least 30 minutes or overnight.
In a bowl, whisk together Jell-O and boiling water until Jell-O is completely dissolved. Add the strawberries. Refrigerate for 5 minutes and then pour on top of cream cheese layer. Refrigerate until firm.