PREHEAT oven to 375°F Stir together 1 cup flour, granulated sugar, baking powder and salt. Cut in 3 tablespoons butter to form crumbly mixture.
COMBINE egg and coffee; add to flour mixture, mixing just until blended. Pour into greased 8-inch (20 cm) square baking pan.
MIX brown sugar and 3 tablespoons flour. Cut in 3 tablespoons butter until mixture is crumbly. Stir in cereal. Sprinkle topping over cake batter. Bake 30 to 35 minute or until toothpick inserted in centre comes out clean. Serve warm.