4 sticks (yes, 1 POUND) salted butter, at room temperature
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1 cup white sugar
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1 1/2 cups confectioners' sugar. Using a hand-held mixer on medium speed, beat together until creamy. Add 2 tablespoons of vanilla and beat until combined.
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Gradually add 4 cups of all-purpose flour to the butter mixture. Beat on low speed until a smooth soft dough forms.
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Preheat your oven to 325 degrees F. Spray a 9x13 baking dish with cooking spray. Press one half of the dough evenly into the prepared pan to form a bottom crust, and place the remaining dough in the refrigerator.
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Bake in the preheated oven until the edges are pale golden brown, about 20 minutes. Let cool for 15 minutesWhile the crust is cooling, make the caramel filling. In a microwave-safe bowl, combine: