Begin by preheating the oven to 350ºF and line a 9×13-inch cake pan* with parchment paper or spray the pan with nonstick cooking spray.
Next, place all dry ingredients into a large bowl and mix well. Set aside.
In a separate bowl, whisk the brown sugar, maple syrup, and vanilla extract together until combined and smooth.
Add the applesauce, shredded apple, Greek yogurt, and almond milk to the bowl and carefully mix.
Crack the eggs into a small separate bowl and gently whisk the eggs to just break the yolks and add them to the wet ingredients and whisk the eggs into the wet ingredients until just combined.
Add the dry ingredients to the wet ingredients and stir until the dry and wet ingredients are mixed together.
Pour the batter into the pan and place the apple cake in the oven and bake at 350ºF for 30-33 minutes.*
While the cake is baking, place all of the ingredients for the cream cheese frosting into a bowl and use an electric mixer to whip all the ingredients together until the frosting is smooth.*
Remove the apple cake from the oven and let it cool completely before frosting the cake.
Dust the cake with a bit more chai spice or top with your favorite chopped nuts.