Gluten-Free Toffee-Pecan Cookie Bars Gelson's

Ingredients

• 1 ½ sticks unsalted butter, room temperature, plus more for greasing pan
• ¾ cups packed brown sugar
• ¼ cup granulated sugar
• ¾ tsp kosher salt
• 1 tsp vanilla extract
• 1 large egg plus 1 egg yolk, room temperature
• 1 ½ cups Bob’s Red Mill Gluten Free 1:1 Baking Flour
• ½ tsp baking soda
• ¾ cup Heath bar pieces, plus more for sprinkling
• ¾ cup dark chocolate chips, plus more for sprinkling
• ¾ cup toasted pecan pieces, plus more for sprinkling
• Flake salt, to taste