Stir Together Apple and Macadamia Cake

Name: Stir Together Apple and Macadamia Cake
Ingredients: 125 gm melted butter ( 1 stick); 2 apples diced ( approximately 3 cups ); 1 cup of brown sugar; 1½ cups of flour; 1 teaspoon of bicarbonate of soda; ¾ teaspoon of baking powder ( optional); 1- 2 teaspoons of cinnamon; 1 teaspoon of ground ginger ( nutmeg or cardamom); 1 egg; 1 cup of macadamias ( or other nuts); Approximately ¼ cup of milk; 1 tablespoon extra melted butter for brushing; 1 small apple (or ½) sliced; Extra chopped nuts