01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper, allowing overhang for easy removal.
02 - Whisk melted butter and granulated sugar in a mixing bowl until well combined. Add eggs and vanilla extract, whisking until mixture is smooth and glossy.
03 - Sift flour, cocoa powder, and salt directly into the wet mixture. Fold gently until just combined, being careful not to overmix.
04 - Pour batter into the prepared pan and spread evenly. Bake for 20 to 25 minutes until edges are set but center still appears slightly fudgy. Cool completely in the pan before cutting.
05 - Heat heavy cream in a small saucepan over medium heat until just simmering. Remove from heat and add chocolate chips, butter, and corn syrup. Let stand for 2 minutes, then whisk until completely smooth. Stir in vanilla extract and salt.
06 - Once cooled, lift brownies from the pan using parchment overhang. Cut into 12 equal squares.
07 - Place one brownie square in the bottom of each serving bowl. Add a generous scoop of vanilla ice cream, drizzle with warm hot fudge sauce, and top with toasted nuts, whipped cream, and a maraschino cherry.