Preheat oven to 400°F.

Combine 3 cups crushed pretzels, 1.25 cups melted butter, and 4.5 Tbsp sugar in a bowl. Spray a 9x13" pan with cooking spray. Press mixture firmly into a prepared pan. Bake for 8 minutes and cool completely.

Beat together cream cheese and 1 cup sugar with an electric mixer until smooth. Fold in whipped topping. Spread over cooled pretzel crust. Refrigerate for 45 minutes or overnight, covered with plastic wrap.

Whisk together jello and 2 cups boiling water until jello is completely dissolved.

Remove from refrigerator once firm and place strawberries in a single layer.

Pour Jell-O mixture on top of the strawberries and cream cheese layer. Refrigerate until firm.

Serve with additional whipped cream, pretzels and sliced strawberries, as desired.