Preparation Steps

• Preheat oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, leaving an overhang on the sides.
• In a large bowl, beat softened butter and granulated sugar until creamy. Stir in flour and salt until a dough forms. Press evenly into the bottom of the prepared pan.
• Bake crust for 20 minutes, or until lightly golden. Remove from oven and let cool slightly.
• In a saucepan, combine brown sugar, heavy cream, and vanilla. Bring to a boil over medium heat, stirring constantly. Boil for 5 minutes, then remove from heat.
• Pour warm toffee mixture over the baked crust. Sprinkle with chopped nuts if using. Return to oven and bake for 15–20 minutes, or until bubbly and set.
• Remove from oven and immediately sprinkle with sea salt. Let cool completely in the pan before slicing into bars.