In a medium bowl, combine crushed pretzels, 0.75 cup granulated sugar, and melted butter. Press mixture evenly into the bottom of a 9x13 inch baking dish.
Bake for 8-10 minutes. Let cool completely.
In a large bowl, beat together softened cream cheese, 1 cup powdered sugar, and vanilla extract until smooth.
Gently fold in the thawed whipped topping until well combined.
Spread the cream cheese mixture evenly over the cooled pretzel crust.
In a small saucepan, combine thawed strawberries, 0.33 cup granulated sugar, cornstarch, and water. Cook over medium heat, stirring constantly, until the mixture thickens and bubbles. Remove from heat and let cool slightly.
Pour the strawberry topping over the cream cheese layer.
Refrigerate for at least 2 hours before serving.
Notes
For a more intense strawberry flavor, you can add a few drops of red food coloring to the strawberry topping.