**Preheat the Oven:** Preheat your oven to 350°F (175°C). Line a 9x13-inch baking dish with parchment paper, leaving some overhang for easy removal.
**Make the Shortbread Base:** In a mixing bowl, beat the softened butter and sugar until creamy. Gradually mix in the flour and salt until a crumbly dough forms.
**Press and Bake:** Press the dough evenly into the prepared baking dish. Bake for 15-20 minutes, or until lightly golden. Let cool slightly.
**Prepare the Caramel:** In a saucepan over medium heat, combine butter, brown sugar, corn syrup, and heavy cream. Stir until the mixture comes to a boil. Continue boiling for 2-3 minutes, stirring constantly.
**Add the Pecans:** Remove the caramel from heat and stir in the chopped pecans. Pour the caramel mixture evenly over the shortbread base, spreading it gently.
**Bake Again:** Return the dish to the oven and bake for another 10-12 minutes, or until the caramel is bubbly and set.
**Add the Chocolate:** Sprinkle the chocolate chips evenly over the hot caramel layer. Let sit for 2-3 minutes to melt, then spread the chocolate into a smooth layer.
**Cool and Slice:** Allow the bars to cool completely in the pan. Refrigerate for 1-2 hours to set, then lift out using the parchment overhang and cut into squares or bars.