Fluffy and Moist Whole Wheat Apple Cake

In a saucepan, combine the margarine, apples, brown sugar, liqueur, and cinnamon.

Sauté the mixture over low heat until the sugar is completely dissolved and the apples are slightly softened but not falling apart.

In a separate bowl, combine the all-purpose flour, whole wheat flour, eggs, milk, and baking powder.

Mix the batter ingredients well until you have a smooth mixture.

Gently fold the slightly cooled apple mixture into the batter, ensuring the baking powder begins to activate immediately upon combining the components.

Transfer the batter to the prepared pan and bake at 350°F (180°C).

Remove the cake from the oven and let it cool slightly before inverting it onto a rack to set and serve.