Melt the chocolate and butter together on the stove top over low-medium heat.

Once a majority of the butter has melted, whisk the brown sugar into the pot.

Once the sugar has been dissolved, remove from the heat and whisk in the remaining ingredients.

Place in a parchment lined square baking pan.

Bake at 340° F for 40 minutes.

Allow to cool on the countertop before storing in the fridge for 2 hours.