1cupGranulated Sugardivided into 1/2 cup and 1/2 cup
1/2cupUnsweetened Cocoa Powderdivided into 1/4 cup and 1/4 cup
1cupAll-Purpose Flour
2tspBaking Powder
1/4tspSalt
Wet Ingredients
1/2cupMilkroom temperature
4tbspUnsalted Buttermelted and cooled slightly
1LargeEgg Yolkroom temperature
2tspVanilla Extract
1/2cupSemisweet Chocolate Chips
1cupBoiling Wateruse freshly boiled water
Instructions
Preheat oven to 350°F (175°C) and grease an 8-inch square baking pan. Use butter or nonstick spray and line with parchment for easy removal if desired.
In a small bowl, whisk together 1/2 cup granulated sugar and 1/4 cup cocoa powder. Set aside. This will become the hot fudge topping.
In a large bowl, mix the remaining 1/2 cup granulated sugar, remaining 1/4 cup cocoa powder, flour, baking powder, and salt until evenly combined. Sift if you prefer a silkier batter.
In another bowl, whisk together milk, melted butter, egg yolk, and vanilla extract until smooth.
Gradually stir the wet ingredients into the dry ingredients until just combined. Do not overmix; a few streaks of flour are okay. Fold in semisweet chocolate chips.
Pour batter into prepared pan, spreading evenly with a spatula. Sprinkle the reserved cocoa-sugar mixture over the top.
Carefully pour boiling water over the batter. Pour evenly and do not stir.
Bake for 22–24 minutes, until the top is set and cracked, with a bubbling sauce visible beneath the cracks.
Let cool for 10 minutes before serving so the sauce settles slightly. Serve warm with vanilla ice cream or whipped cream.
Notes
Serve with vanilla ice cream or whipped cream for contrast. You can also add fresh berries or toasted nuts for extra flavor.