Cover baking sheet with parchment paper or non-stick foil.
Spray again with baking spray.
Add flour and 1/2 cup of white sugar in a large bowl and mix to combine.
Add butter to the bowl and using a pastry cutter, 2 butter knives, or a fork, cut butter in flour mixture until it is well blended. If your butter is too cold and this seems difficult you can gently rub small portions of the crust mix in between your hands until the mixture holds together when squeezed.
Place the mixture into prepared jelly roll pan and spread out evenly. With the flat bottom of a measuring cup, or your hand, press crust into the pan.
Place crust into a preheated oven and cook for 15 to 20 minutes, just until edges of crust begins to turn light brown.
Remove from oven.
Place eggs into a mixing bowl and beat slightly.
Add sugar, corn syrup, melted butter, and vanilla. Mix until well combined.
Add pecans and mix well.
Pour pecan mixture over crust.
Return pan to oven and bake for 25 minutes. Do not over bake or the bars will be hard.
Remove from oven and allow to cool completely before attempting to cut.
If edges are too hard, just cut the edges off prior to cutting into serving sized pieces.
Nutritional data provided for informational purposes only. Let's face it, if you are eating these, dietary restrictions are not your main focus, but if they are, please visit your favorite recipe calculator for vital details.Adapted from Allrecipes