Preheat oven to 350 degrees F. Grease 9x13-inch baking dish. Set aside.
In a large microwave-safe bowl, melt the butter then add in flour, sugar, salt, and chopped pecans. Stir the crust ingredients together until just combined.
Firmly press the crust into a greased baking dish.
Bake 20 minutes until edges are light golden brown.
In a clean bowl, combine brown sugar, 6 tablespoons of flour, and salt
Add in corn syrup, eggs, and vanilla. Mix well on medium speed. Stir in chopped pecans.
Spread filling over the crust as soon as it comes out of the oven.
Bake 30-35 minutes until filling is set.
Cool completely before cutting into bars.