Preheat oven to 180 degrees C. Grease and flour one 20x30cm cake tin.
In a mixing bowl; beat oil and eggs with an electric mixer until creamy. Add the sugar and vanilla and beat well.
Combine the flour, salt, bicarb soda and ground cinnamon together in a bowl. Slowly add this mixture to the egg mixture and mix until combined. The batter will be very thick. Fold in the apples by hand using a wooden spoon. Spread batter into the prepared tin.
Bake at 180 degrees C for 45 minutes or until cake tests done. Let cake cool on a wire rack. Once cake is cool serve with a dusting of icing sugar or with a cream cheese icing.