Preheat oven to 180•C.
Grease a small loaf tin
Mix brown sugar and cinnamon together in a bowl and set aside.
Combine white sugar and coconut oil until smooth.
Add eggs and vanilla and whisk again.
Add flour, protein and baking powder, then milk. Mix.
Pour half the batter into the prepared loaf tin.
Cover with half of the apples patting them into batter with the back of a spoon.
Sprinkle with half of cinnamon sugar mixture.
Pour the remaining batter over apple layer and top with remaining apples and cinnamon sugar.
Pat topping into the batter with the back of a large spoon. Use a butter knife held vertically to swirl figure eights through the batter to slightly incorporate the topping.
Bake for 45-50 minutes or until toothpick inserted into the center comes out clean.
Let cool before slicing.
