Preheat your oven to 175°C (350°F). Grease your 9x13 inch baking pan or line it with parchment paper to prevent sticking.
In a mixing bowl, combine the flour, brown sugar, and a pinch of salt. Add the cold, cubed butter and use your fingers or a pastry cutter to work the butter into the dry ingredients until the mixture resembles coarse crumbs. Press this mixture evenly into the bottom of your prepared pan, creating a firm, even layer.
Bake the crust for about 15 minutes until it turns a light golden color and smells buttery and sweet. This helps set the base for the filling.
While the crust bakes, melt the butter in a saucepan over medium heat. Once melted, stir in the maple syrup, vanilla extract, and salt. Bring the mixture to a gentle boil, then reduce the heat and simmer for 2 minutes, stirring constantly to develop a rich caramel flavor.
Remove the saucepan from heat and fold in the toasted pecans, ensuring they are well coated with the syrup mixture. The filling will be thick and sticky, with a fragrant aroma of toasted nuts and maple.
Carefully pour the pecan and maple syrup mixture over the baked crust, spreading it evenly with a spatula. Return the pan to the oven and bake for another 20–25 minutes until bubbling around the edges and the top is slightly caramelized.
Once baked, remove the pan from the oven and let the bars cool completely on a wire rack. The filling will thicken as it cools, setting into a sticky, luscious layer.
When cooled, use a sharp knife to cut the bars into squares. Wipe the knife between cuts for clean slices. Serve at room temperature for the best flavor and texture.
Enjoy these bars with a cup of coffee or tea, relishing the crunchy edges and gooey, caramelized center that’s full of cozy, nutty sweetness.