Preheat the oven. Before starting the recipe, preheat oven to 350 degrees. Line a 9x9 inch square pan with parchment paper leaving overhangs on 2 sides for easy removal of bars after baking.
Make the crust. Mix flour, sugar and salt in a bowl and then add in the cold cut butter. Mix in butter in the flour mixture till a crumb-like texture is formed and all the crumbs are almost equal in size. You can do this using a food processor. Or even a pastry dough cutter works well. If you don't have either of those, you can cut butter into flour using 2 forks.
Add crust to the pan. Once the crumb mixture is ready, pat it down into pan evenly and bake in the oven for 15 minutes. The crumb will begin to look golden in color.
Make the filling. While the crust is baking, it's time to make pecan filling. Mix all the ingredients together (leave out the pecans) and bring to a boil on the stove. Simmer for 2 minutes and then turn off the heat. Add in pecans and stir.
Pour over the crust. Pour the mixture over the top of baked crust. Place it in the oven and bake for 25-30 minutes. A toothpick inserted in the middle will come out mostly clean.
Cut into squares. Set bars on a cooling rack. Once the pecan bars have cooled, take them out of the pan using overhangs. Cut them into squares and enjoy!