Step 1: Preheat your oven to 350°F (175°C) and grease an 8x8-inch baking dish.
Step 2: In a medium bowl, combine the graham cracker crumbs, melted butter, and granulated sugar. Mix well until fully combined.
Step 3: Press the crust mixture evenly into the bottom of the prepared baking dish.
Step 4: Bake for about 10 minutes, or until lightly golden.
Step 5: Let the crust cool completely.
Step 6: In a medium saucepan, melt the granulated sugar over medium heat, stirring constantly, until it turns a deep amber color.
Step 7: Remove the saucepan from the heat and stir in the butter until fully melted.
Step 8: Gradually stir in the heavy cream until the sauce is smooth and creamy.
Step 9: Pour the caramel sauce evenly over the cooled graham cracker crust.
Step 10: Chill the bars in the refrigerator for about 30 minutes, or until the caramel layer is set.
Step 11: In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer.
Step 12: Remove the saucepan from the heat and stir in the chocolate chips until fully melted and smooth.
Step 13: Pour the chocolate ganache evenly over the chilled caramel layer.
Step 14: Chill the bars in the refrigerator for about 1 hour, or until the chocolate topping is set.
Step 15: Optional: Sprinkle with sea salt and garnish with chopped nuts.
Step 16: Cut the bars into squares and serve them chilled. Enjoy your delicious and indulgent dessert!