01 - Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper.
02 - In a mixing bowl, whisk melted butter and granulated sugar until combined. Add eggs and vanilla extract, mixing until smooth.
03 - Sift in all-purpose flour, unsweetened cocoa powder, and salt. Stir gently until just combined without overmixing.
04 - Pour batter into the prepared pan and smooth the surface. Bake for 22 to 25 minutes, or until a toothpick inserted in the center comes out with moist crumbs.
05 - Allow brownies to cool completely in the pan before cutting into 6 equal squares.
06 - Place one brownie square in each serving bowl. Top each with a generous scoop of vanilla ice cream.
07 - Drizzle warm chocolate sauce over the ice cream, sprinkle with chopped toasted nuts, and optionally top with whipped cream and a maraschino cherry. Serve immediately.