In a medium saucepan over medium heat, melt the butter and cocoa powder together and stir with a wooden spoon until smooth and glossy. Remove from the heat, and stir in the sugar. Add the eggs and vanilla, stirring until fully incorporated. Stir in the flour and salt.

Pour batter into the prepared baking dish and bake for 20 minutes. Remove from oven and top with Milky Way caramels in a single layer and return to oven for 3-5 minutes. Using a spatula, smooth melted caramels over the top. Set aside while you work on the crispy layer.

Place the chocolate and chocolate peanut butter in a medium microwave-safe bowl. Heat in the microwave for about 1 minute, remove, and stir until smooth. Return to microwave to melt more if necessary. Stir in the cereal, then spread mixture evenly over brownies, smoothing the top with a knife or spatula.

Once brownies have cooled, cover with foil and refrigerate for 2-3 hours (or overnight) to allow the top layer to harden completely. Cut into squares and enjoy!