In a large bowl, combine butter and sugars until creamy. Add 2 tablespoons vanilla. Gradually add flour, mix until a soft dough forms. Preheat oven to 325. Spray a 9x13 baking dish with cooking spray. Press 1/2 of the dough into the bottom of the dish. Place the remaining dough in the refrigerator. Bake the prepared dish in the preheated oven for20 minutes. Then let cool 15 minutes.
In a microwave safe bowl, combine unwrapped candies, heavy whipping cream, and 1/2 teaspoon vanilla. Microwave 1 minute. Stir. If not melted completely, microwave 30 seconds and stir. Repeating until melted. Pour caramel over crust. Sprinkle with sea salt. Remove remaining dough from the refrigerator. Crumble it over the top of the caramel. Return to the oven 25-30 minutes. Let cool before cutting.