Step 1Heat the oven to 350 degrees. Grease and flour an 8-inch square or round pan.
Step 2Place the carob chips and butter in a glass bowl, and microwave them until the butter melts, 1 minute. Stir them together until they're smooth. Cool slightly.
Step 3Beat the sugar and eggs in the bowl of an electric mixer until foamy, 2 minutes. Transfer the carob mixture to the mixing bowl with a rubber spatula, and mix on low speed until blended. Stir in the flour, baking powder and salt and beat lightly. Stir in the brandy.
Step 4Pour the batter into the prepared pan and bake until a toothpick inserted in the center of the cake comes out clean, 20 to 25 minutes. Cool the cake in the pan, then turn it out on a serving dish. Shake the powdered sugar through a strainer to sprinkle on top.