Line a pan with parchment with parchment hanging on the sides. Preheat the oven to 350 deg F (176 C). In a bowl, mix in the wet ingredients for the cake, until the sugar is fully combined.
Add 1 1/2 cup flour, baking powder, baking soda, cinnamon and salt.
Fold into the wet until just about combined. Add more flour if needed 1 tbsp at a time to make just slightly thick batter.
In another bowl, drizzle maple over chopped apple and toss to coat. Add the apple to the batter and fold in.
Pour into the parchment lined pan and even it out. Sprinkle coconut sugar over the batter
Bake at 350 degrees F for 35 to 45 mins (depends on the pan, cake height etc). Cool for 10 mins, then remove from pan. Cool completely before slicing. Store on the counter for the day, refrigerated for upto 7 days, freeze (slices) for upto a month
To make cupcakes/muffins: Bake for 22 to 24 mins for regular size muffins.
Heat 1 cup non dairy milk with the sugar, vanilla extract, almond extract and bring to a boil over medium heat. Add cinnamon or other flavoring as needed. Add a pinch of turmeric for color.
Mix the starch in 1/4 cup nondairy milk then add to the boiling milk. Bring to a good boil and take off heat. Custard will thicken as it cools. (See tips in the post if it doesnt thicken). Serve apple cake slices drizzled with custard