Preheat your oven to 350˚.

In a large bowl whisk together the melted butter and cocoa powder. Next whisk in the sugar and vanilla until completely combined, then one at a time mix in the eggs. Fold in the flour until it is just barely completely combined. Lastly fold in the hot fudge sauce. Pour into a foil lined baking dish.

Place in the oven and allow to cook for about 20 minutes, until the batter no longer sticks to a toothpick. Remove from the oven and allow the brownies to cool on a rack.

In a sauce pan whisk together cornstarch and 1Cup of sugar oven a medium heat. Add in melted butter and half anf half bring to a boil, reduce heat and allow to simmer while constantly stirring. Once it thickens up remove from the heat and add the vanilla.

Pour over the brownies, sprinkle the remaining sugar and place in the broiler or use a kitchen torch to caramelize the sugar.

Place in the fridge to cool and cut into bars to serve.