Salted Caramel Butter Bars Recipe 435

Steps:

• Butter a 9 1/2-by-13-inch rimmed baking sheet or quarter sheet pan and line it with parchment, leaving a 2-inch overhang on the 2 long sides. Then butter the parchment.
• Whisk the flour, cornstarch, kosher salt and cinnamon in a large bowl.
• Beat the butter and sugar in a medium bowl with an electric mixer on medium speed until light and fluffy, 5 to 7 minutes. Add the egg and vanilla and beat to combine, scraping down the sides as needed. Slowly add the flour mixture and beat on low until the dough is just combined; do not overwork.
• Transfer the dough to the prepared baking sheet, spreading it out as evenly as possible with a silicone spatula. Cover with plastic wrap, then use your hands to press and flatten the dough into a smooth even layer. Pull back the plastic wrap and use a fork to prick the dough all over. Cover again and refrigerate until cold, about 1 hour.
• Position an oven rack in the center of the oven and preheat to 325 degrees F.
• Uncover the dough and bake, rotating the baking sheet from front to back halfway through, until golden, 45 to 50 minutes. Transfer to a wire rack and let cool completely, about 1 hour.
• Combine the caramels and cream in a microwave-safe bowl and microwave in 30-second intervals, stirring between each, until melted and smooth, about 2 minutes. Pour the mixture over the shortbread and spread it evenly. Immediately sprinkle with the peanuts and a large pinch of flaky salt. Gently push down on the topping to make sure it sticks to the caramel. Let cool completely, about 1 hour.
• Use the parchment overhang to gently lift the shortbread and slide it onto a cutting board. Remove the parchment and cut into 24 squares. Store the bars in an airtight container at room temperature for up to 5 days.