Lingkan Reang
Preheat oven to 180°C and line a baking pan with parchment paper.
Melt chocolate and butter in the microwave, then set aside.
Mix brown sugar, vanilla, salt, and the melted chocolate mixture.
Add eggs one at a time, whisking for 1 minute, then mix in flour and cocoa powder.
Spoon the batter into the pan and swirl in warmed peanut butter.
Bake for 25-30 minutes, cool completely, and enjoy with milk.