1/3cupunsalted butter, meltedroom-warm or freshly melted
3/4cupwhole milkroom temperature is fine
2teaspoonsvanilla extract
1 1/2cupsgranulated sugar
1 1/4cupsall-purpose flour
1/2cupdark cocoa powder, dividedsee directions
2 1/4teaspoonsbaking powder
3/4teaspoonsalt
1 1/2cupslight brown sugar, packed
1 1/2cupshot waterjust boiled or very hot from the kettle
Instructions
Preheat your oven to 350°F (175°C). Have a 9×13-inch baking dish ready.
Pour the melted butter into a 9×13-inch baking dish, spreading it evenly over the bottom so the butter creates a thin shiny layer.
In a large bowl, whisk together the milk, vanilla extract, and granulated sugar until the sugar is mostly dissolved and the mixture is smooth.
Add the flour, 1/4 cup of the dark cocoa powder, baking powder, and salt to the bowl. Whisk until just combined and no dry streaks remain — don’t overmix.
Gently spoon the batter over the butter in the baking dish, spreading it so it covers the butter. Do not stir or mix the batter into the butter.
In a small bowl, combine the remaining 1/4 cup dark cocoa powder with the packed light brown sugar. Sprinkle this cocoa-brown sugar mixture evenly over the top of the batter.
Carefully pour the hot water over the top of the sugar layer. Pour slowly and gently so you don’t disturb the batter — again, do not stir.
Bake for 30–35 minutes, or until the top is set and dry. The top should look cakey while the inside beneath will be sauce-like.
Let cool slightly before serving so the sauce thickens just right — about 10 minutes. Serve warm with ice cream or whipped cream.
Notes
For best results, serve warm with a scoop of ice cream for the ideal contrast of temperatures.