Preheat the oven to 350°F (180°C). Grease and line an 8x8 square cake pan with parchment paper, leaving some overhang for easy removal after baking.
In a large bowl, combine the sugar, water, and chopped chocolate. Heat the mixture gently in the microwave or over a double boiler until the chocolate is melted, about 2-3 minutes. Stir occasionally. Let it cool slightly.
Once the chocolate mixture has cooled, whisk in the eggs, oil, and vanilla extract until smooth and combined.
In a separate bowl, sift together the all-purpose flour, cocoa powder, baking powder, and salt to remove any lumps and ensure even mixing.
Gradually fold the sifted dry ingredients into the wet mixture. Stir gently until the batter is just combined with no streaks of flour.
Take 1/4 cup of Signature Salted Caramel Sauce and gently swirl it into the brownie batter using a spoon. Reserve the remaining 1/4 cup of caramel sauce for topping.
Pour the batter into the prepared cake pan and spread it evenly. Drizzle the remaining 1/4 cup of caramel sauce over the top and swirl with a skewer or knife. Bake for 55-65 minutes. Check for doneness by inserting a toothpick. If it comes out with moist crumbs, the brownies are done.
Let the brownies cool in the pan for 30 minutes before cutting into squares. Serve them warm with vanilla ice cream and extra caramel sauce if desired.