**Make the Pretzel Crust**
- Preheat the oven to 350°F (175°C).
- In a bowl, mix crushed pretzels, melted butter, and sugar until well combined.
- Press the mixture into the bottom of a 9x13-inch baking dish.
- Bake for 8-10 minutes, then let cool completely.
**Prepare the Cream Cheese Layer**
- In a mixing bowl, beat the cream cheese, sugar, and vanilla until smooth.
- Fold in the whipped topping until fully combined.
- Spread evenly over the cooled pretzel crust, ensuring it reaches the edges to prevent the Jell-O from seeping through.
- Refrigerate for at least 30 minutes to set.
**Make the Strawberry Jell-O Topping**
- In a bowl, dissolve the Jell-O in boiling water, stirring until fully dissolved.
- Let it cool slightly for about 10-15 minutes, then stir in the sliced strawberries.
**Assemble and Chill**
- Gently pour the cooled Jell-O mixture over the cream cheese layer.
- Refrigerate for at least 2-4 hours, or until fully set.
**Serve**
- Slice and serve chilled. Enjoy this refreshing dessert with extra whipped cream if desired!