Preheat the oven to 350°F.
In a medium mixing bowl, use a stand or hand mixer to mix all the crust ingredients until fully incorporated.
1 cup salted butter, cut into small pieces, 1¾ cup all-purpose flour, ¼ cup cornstarch, ½ cup granulated sugar, ¼ tsp table salt, ¼ tsp vanilla extract
Once the dough is fully mixed, press it by hand into the bottom of a 9x13 casserole dish. Make sure to press firmly, covering the entire bottom evenly.
Bake for 20–25 minutes. When done, set the crust aside, keeping the oven on.
In another medium mixing bowl, use a large wooden spoon to combine the brown sugar, granulated sugar, salt, and cornstarch, mixing until fully incorporated. In a small bowl, whisk together the eggs, cream, and syrup. Add the egg mixture to the sugar mixture, stirring until fully combined.
1 cup light brown sugar, ½ cup granulated sugar, ⅛ tsp table salt, ½ cup cornstarch, 4 large eggs, ½ cup heavy whipping cream, 1 cup maple syrup
Pour the mixture into a large saucepan over medium heat. Bring it to a simmer, stirring constantly. Remove from heat and add the butter, stirring until melted. (Tip: slice the butter into tablespoon-sized pieces to help it melt faster.) Stir in the vanilla and pecans, ensuring the pecans are fully coated and well incorporated.
1 cup unsalted butter, 1 tsp vanilla extract, 4 cups chopped pecans
Pour the pecan mixture over the crust, spreading it evenly. Bake for 35 minutes.
Let the bars cool to room temperature, then chill in the refrigerator for at least 6 hours before slicing.
Once cooled, slice into 12 or 16 bars. Use a spatula to remove from the pan and serve immediately.