01 -
Preheat oven to 350°F. In a small bowl, whisk together flour, baking soda, and salt. Set aside. In an electric mixer, cream butter and sugars until combined. Add vanilla and egg, mixing well. Gradually add dry ingredients and mix until incorporated. Fold in chocolate chips. Press batter into a rectangular tart pan, raising the edges slightly. Chill in the fridge for 5 minutes. Bake for 22-25 minutes or until golden brown. If edges brown too quickly, cover them with foil. Cool briefly, then press down the center to create space for the caramel filling. Cool completely before adding the next layer.
02 -
Warm heavy cream in the microwave and set aside. In a saucepan, combine sugar, corn syrup, and water. Cook over medium heat, stirring gently until dissolved. Once bubbling, stop stirring and allow the mixture to reach a honey color. Remove from heat and carefully stir in warm cream. Add butter, salt, and vanilla, stirring to combine. Cool slightly. Pour caramel sauce into the cookie base, reserving space for the chocolate glaze. Chill in the refrigerator. Store extra caramel in a sealed jar in the fridge.
03 -
Melt butter and chocolate in a microwave-safe bowl, stirring occasionally. Stir in corn syrup and cool briefly to thicken. Pour the chocolate mixture over the caramel layer. Use an offset spatula to spread evenly. Sprinkle with fleur de sel. Chill until set. Slice thinly as the dessert is very rich.