– Make the brownies according to the instructions on the box including ingredients listed. I recommend using the directions for a 9×9" pan. Bake for half the time listed on the box. – While the brownies are baking, whisk together eggs, white sugar, brown sugar, corn syrup, vanilla extract, and melted butter. Stir in 1 cup of pecans. Pour this over the top of the half-baked brownies. Sprinkle the remaining cup of pecans evenly over the top.
– Bake for the remainder of the time listed on the box. Check to ensure the top is cooked. The brownies will be finished when the pecan topping barely jiggles when shaking the pan. Remove and allow to fully cool before serving. The topping will firm up once cooled. The brownies will be very fudgy.