Preheat the oven to 350°F (175°C) and line a 9x13-inch baking pan with parchment paper.
In a bowl, mix the flour, brown sugar, and softened butter until a crumbly dough forms. Press this mixture into the prepared pan and bake for 15-20 minutes.
In a separate bowl, whisk together the melted butter, brown sugar, corn syrup, eggs, and vanilla extract. Fold in the chopped pecans.
Pour the filling over the pre-baked crust and spread evenly. Bake for 25-30 minutes until the filling is set.
Cool completely before cutting into squares. Enjoy your Lazy Pecan Pie Bars!