Make your flax eggs by mixing flax with water. Let sit for at least 5 minutes until thickened.
Preheat oven to 350 degrees.
Add all wet ingredients to a bowl and mix until just combined. Pour in dry ingredients except for apples. Mix again until just combined. Lastly fold in apples.
Pour dough and spread evenly into an 8x8 baking dish lined with parchment paper.
Bake bars for 20-28 minutes. I baked mine for 25 minutes, a knife should come out mostly clean when finished cooking.
Let bars cool for 15 minutes, slice and enjoy. Store the leftover bars in a sealed container in your fridge for up to 5 days, or in your freezer for months.
Notes
It is essential to let the bars cool otherwise they will be crumbly. Allowing the bars to cool allows them to firm up.