2In a large bowl, combine eggs, erythritol (or sugar), oil, yogurt, milk, flour, almond flour, baking powder, and cinnamon (if using). Mix until you get a smooth batter.
3Fold the diced apples into the batter.
4Pour the mixture into a lined cake pan.
5Bake in a static oven at 160°C (320°F) for 45 minutes or in an air fryer at 150°C (302°F) for about 35 minutes.
6Let the cake rest in the turned-off oven for 10 minutes.
7Remove from the oven, let cool, slice, and serve.