Chocolate Mint Brownies have a thin layer of delicate mint running through them . . . in the form of an After Eight Mint!
Preheat the oven to 325°F and adjust a rack to the center.
Spread half of the batter into the pan and then place the After Eights on top, to form one even layer. Their edges should be touching each other.
Spread the remaining half of the batter on top of the candies evenly, and place the baking dish in the preheated 325°F oven just until the batter is cooked all the way through and is set, about 40 minutes.