Chop the apples and place in a large bowl.Add the cinnamon and a tablespoon or two of the sugar and set aside for 15 minutes to get some of the juice out.
Mix all the remaining dry ingredients including the remaining sugar.Mix the egg and oil into the apples and add the dry ingredients slolwy, mixing well. The batter and apple mixture will be stiff.Fold in the aronia berries, being careful not to crush them.
Spread the mixture into the prepared, lightly greased baking pan, and crumble the brown sugar on top.
Bake the cake for 40 minutes or until toothpick comes out clean.
Let the cake cool and set-up for 15 minutes before cutting.