Prepare the Baking Sheet
Line a baking sheet with parchment paper or a silicone baking mat. Set aside.
Toast the Pecans
Preheat the oven to 350°F (175°C).
Spread the pecans in a single layer on a baking sheet and toast for 8-10 minutes, stirring halfway through. Keep an eye on them to avoid burning. Once done, remove from the oven and set aside to cool.
Make the Caramel Base
In a medium saucepan, melt the butter over medium heat.
Stir in the brown sugar and bring to a simmer. Cook for 3-4 minutes, stirring frequently, until the sugar has dissolved and the mixture has thickened slightly.
Remove the saucepan from the heat and stir in the vanilla extract.
Assemble the Bark
Pour the caramel mixture evenly over the prepared baking sheet. Use a spatula to spread it out into an even layer.
Immediately sprinkle the toasted pecans evenly over the caramel layer.
Add the Chocolate Layer
In a microwave-safe bowl, melt the chocolate chips in the microwave in 20-second intervals, stirring in between, until smooth and fully melted.
Pour the melted chocolate over the pecans and caramel layer. Use a spatula to spread it out evenly.
Chill the Bark
Allow the pecan pie bark to cool at room temperature for about 30 minutes, then transfer it to the refrigerator to chill for at least 2 hours, or until the chocolate has fully set.
Break Into Pieces
Once set, break the bark into pieces of your desired size.