01 -
Coat a 9-inch square baking dish with nonstick cooking spray and line with parchment paper.
02 -
Distribute chopped pecans evenly in a single layer over the parchment-lined dish.
03 -
Place butter, sugar, and salt in a heavy-bottomed 3-quart pot. Heat over medium-low while stirring frequently until sugar fully dissolves.
04 -
Continue to cook, stirring occasionally, until the mixture reaches 290°F to 300°F on a candy thermometer, corresponding to the hard crack stage.
05 -
Remove the pot from heat and gently mix in vanilla extract.
06 -
Carefully pour the hot toffee mixture over the pecans, spreading evenly.
07 -
Allow the toffee to rest for several minutes, then sprinkle chocolate chips uniformly over the surface.
08 -
Cover the dish with foil and let it sit for 5 minutes or until chocolate chips are softened.
09 -
Remove foil and use an offset spatula to spread the melted chocolate into an even layer.
10 -
Transfer the dish to the refrigerator and allow the mixture to cool completely, at least 2 hours.
11 -
Using the parchment, lift toffee from the dish and transfer to a cutting board. Break into pieces with a sharp knife and store in an airtight container in a cool place.