Place 1½ cups butterscotch chips and 2 tablespoons melted butter in a large microwave-safe bowl. Heat in 30-second intervals, stirring after each interval, until melted and smooth.
Let the butterscotch mixture cool slightly. Stir in 1 cup light corn syrup, 3 lightly beaten eggs, and 1 teaspoon vanilla extract until well combined.
Fold in 1½ cups pecan halves.
Pour the mixture into 1 unbaked 9-inch pie crust.
Bake for about 50-60 minutes until the top is slightly browned. The center will not be all the way set.
Allow it to cool for 2 hours. Then the pie is ready to slice, serve and enjoy!
Notes
Refrigerate the leftovers, covered for up to 4 days.