Pecan Pie Cookie Bars

Name: Pecan Pie Cookie Bars
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: American, Southern
Ingredients: 1 cup unsalted brown butter (room temperature); 1/2 cup light brown sugar; 1/2 teaspoon vanilla extract; 1/4 teaspoon kosher salt; 2 cups all purpose flour; 1 cup dark corn syrup; 3 large eggs (room temperature ); 6 tablespoons unsalted butter (melted); 2 teaspoons vanilla extract; 1/2 teaspoon ground cinnamon (optional); 1/2 teaspoon kosher salt; 2 cups toasted pecans (roughly chopped); 1 1/2 cups whole pecan halves (for topping); flaky sea salt (for topping)