Preheat the oven to 350 degrees.
Prep a 13 x 9 inch metal baking pan with nonstick baking spray.
Prepare brownies as directed on the back of the brownie box.
Bake at 350 degrees for half of the time listed on the box of brownies.
With an electric mixer blend the sugar, corn syrup, eggs, butter, and vanilla. Mix completely.
Use a large spoon to add in the chopped pecans.
Remove the brownies from the oven.
Spoon the pecan filling on top of the brownies.
Use an offset spatula even the top layer of the filling.
Return the brownies to the oven. Continue to bake at 350 degrees for 25 to 35 minutes
Bake until a toothpick inserted in the center comes out clean.
Take out of the oven
Allow to cool completely
Cut, serve and Enjoy!