Peel the apples and slice them into quarters or eighths. Set aside.
Whisk the almond flour, brown rice flour, corn starch, baking powder, ground cinnamon, and salt in a medium bowl.
In a large bowl beat the eggs with the brown sugar, oil, and vanilla extract until well incorporated.
Pour the dry ingredients into the mixture.
Beat until integrate everything, and the mixture is homogeneous.
Pour the mixture into the prepared pan and topped with the apples.
Cook for 40 minutes, keep in mind that all ovens are different. To know if it´s ready insert a toothpick in the center and when it comes out it should be clean without a trace of batter.
Let cool before removing.
Sprinkle the cake with powdered sugar
Notes
Store the cake in an air-tight container at room temperature for up to 3 days or you can store it in the fridge for 5 days.