Preheat your oven to 325°F (160°C) and prepare a 13x9 inch baking pan with aluminum foil.
Cream the softened unsalted butter and white sugar together until light and fluffy, then add powdered sugar and vanilla extract.
Gradually add all-purpose flour until a soft dough forms.
Press half the dough evenly into the bottom of the prepared baking pan.
Bake crust for about 15 minutes until edges are lightly golden.
Pour salted caramel sauce over the cooled crust.
Crumble remaining dough over the salted caramel layer.
Sprinkle sea salt on top.
Bake for 25-30 minutes until topping is golden brown.
Allow to cool completely, refrigerate for at least 1 hour, then slice and enjoy.