Preheat oven to 325°F (163°C).
Mix butter and powdered sugar until creamy.
Add flour and salt until crumbly dough forms.
Press dough into a parchment-lined 9x9-inch pan.
Bake for 25 minutes until lightly golden.
Cool completely.
Spread strawberry preserves evenly over crust.
Top with whipped topping.
Chill for 1 hour before slicing into bars.
