In a medium saucepan, combine sugar, butter, corn syrup, and salt. Cook over medium heat, stirring constantly, until the butter is melted and the sugar is dissolved.
Bring the mixture to a boil and cook, stirring occasionally, for 5-7 minutes, or until it reaches 290 degrees F (143 degrees C) on a candy thermometer.
Remove from heat and stir in the vanilla extract.
Stir in the chopped pecans until evenly coated.
2 cups pecans
Spread the pecan mixture thinly onto the prepared baking sheet.
Sprinkle the chocolate chips evenly over the hot pecan mixture. Let stand for 5 minutes to soften.
2 cups pecans
Gently spread the melted chocolate over the pecans to create an even layer.
Let the bark cool completely at room temperature, or in the refrigerator, until the chocolate is firm.
Once firm, break the bark into pieces.
Notes
Store in an airtight container at room temperature for up to a week.