Mix together confectioners sugar, maple syrup, milk, cinnamon and nutmeg till combined.
Cake
Preheat oven to 325 F degrees. Spread chopped walnuts on a baking tray.
Toast the nuts in the oven till fragrant, around 7-8 minutes. Set aside.
Grease a bundt pan and set aside.
In a bowl sift together all purpose flour, salt, baking powder, cinnamon powder and nutmeg. Chop apple into small pieces and combine with toasted walnuts and set aside.
In another bowl beat together oil, applesauce and both the sugar till well combined, around 2 minutes.
Add eggs, vanilla and mix till combined.
Add the dry ingredients in 3 parts and mix till combined but do not overmix.
Fold in the apple and walnuts.
Transfer batter to a 12 cup bundt pan and bake at 325 F degrees for 70-75 minutes or till toothpick inserted in center comes out clean.
Let the cake cool in the pan for 10 minutes and then transfer to a wire rack to cool completely.
Drizzle the glaze all over the cake, cut into pieces and serve immediately.