Preheat your oven to 350°F. Give a 9x13-inch baking pan a good coat with cooking spray so nothing sticks.
Mix the flour and granulated sugar in a bowl, then cut in the softened butter until it looks crumbly—kind of like damp sand.
Press that crumbly mix into your pan, making it as even as you can, and bake for 18-20 minutes until it’s just turning golden.
While the crust bakes, whisk together the eggs, brown sugar, corn syrup, melted butter, vanilla, and salt until everything’s smooth and combined.
Fold in the pecan pieces so they’re all coated with the filling.
Pour the filling right over the hot crust so it spreads out easily, then pop the pan back in the oven.
Bake for 30-35 minutes, until the top looks set and the center jiggles just a little if you nudge the pan.