2 Preheat oven to 350°F. Line a 9×13-inch baking pan with parchment paper, or grease with cooking spray.
3 Prepare brownie batter according to package instructions.
4 Pour about 1/3 of the brownie batter into the prepared baking pan. Spread until the bottom of the pan is evenly coated. Then add two even layers of pretzels, covering the entire surface.
5 Carefully spoon the remaining brownie batter on top to cover the pretzels.
6 Bake for 30 minutes, or until a toothpick inserted in the middle of the brownies comes out clean. Remove and set on a cooling rack to cool.
7 Spoon the caramel sauce onto the top of the brownies in an even layer. (If it is too thick, spoon the sauce into a small bowl first and microwave for 30 seconds to thin.)
8 Sprinkle with some coarse sea salt. And then once the brownies have cooled, lift them out of the pan if you used parchment paper for easy cutting.
9 Cut them into individual bars, and watch that ooey gooey caramel mix with those salty pretzels and chocolate. Serve warm, or let cool to room temperature then serve.