
Vegetable shortening, for greasing
2 cups butter, softened
1 cup granulated sugar
1½ cups powdered sugar
1½ tablespoons plus ¾ teaspoon vanilla extract, divided
4 cups all-purpose flour
1 (11-ounce) bag caramel bits
½ cup heavy whipping cream
2 tablespoons coarse sea salt
Purchased caramel sauce