Preheat oven to 350℉ and line a 9x13 pan with parchment paper.
Melt butter and brown sugar in a large saucepan. Bring the mixture to a boil over medium heat, stirring with a wooden spoon. Remove from heat. Stir in the molasses and raisins.
Cool until warm.
Mix in the eggs with the wooden spoon until well incorporated.
In a separate bowl whisk together the flour, baking powder, baking soda and cinnamon.
Add to the saucepan and stir until about half mixed in, then add in grated apples. Continue stirring until well blended.
Spread into parchment lined pan and bake at 350℉ for 25 - 30 minutes or until a toothpick inserted in the middle comes out clean.
Place on cooling rack. Sprinkle with maple sugar or icing sugar before serving.
Recipe by Chateau Elma at https://www.chateauelma.com/autumn-square