Preheat the oven to 350°F (180°C). Butter and line an 8x8 square cake pan with parchment paper and set aside.
In a large bowl, combine the sugar, water, and chopped chocolate. Gently heat this mixture in the microwave or over a bain-marie for 2-3 minutes until the chocolate is fully melted. Allow it to cool slightly.
Once the chocolate mixture has cooled, whisk in the eggs, oil, and vanilla extract until smooth and combined.
Sift the flour, cocoa powder, baking powder, and salt together in a separate bowl. Gradually fold the sifted dry ingredients into the wet chocolate mixture, stirring until just combined. Be careful not to overmix.
Swirl in 1/4 cup of My Signature Salted Caramel Sauce into the batter.
Pour the batter into your prepared cake pan and spread it evenly. Drizzle the remaining 1/4 cup of My Signature Salted Caramel Sauce on top of the batter, and use a skewer or knife to swirl the caramel into the batter.
Bake the brownies for 55-65 minutes. To check for doneness, insert a toothpick or cake tester into the center. The toothpick should come out with a few moist crumbs. For a fudgier texture, bake closer to 55 minutes.
Once baked, allow the brownies to cool in the pan for at least 30 minutes before cutting.