Preheat the oven to 350 degrees F. Grease or line a 9x13 pan with parchment paper.

In a large bowl, sift together flours, baking powder, baking soda, and cinnamon.

In a medium bowl, add the coconut sugar, milk, maple syrup, coconut oil, and vanilla extract. Whisk until combined.

Pour the wet ingredients into the bowl with the dry ingredients and mix until just combined.

Toss the chopped apple in a little bit of flour (this prevents them from sinking to the bottom of the blondies) and fold into batter.

Pour the batter into the pan and sprinkle optional nut pieces on top.

Bake in the oven for 25 minutes, or until a toothpick inserted comes out clean. Cool before slicing and serving.