Preheat oven to 350 degrees. Spray 8×8 baking pan with cooking spray.
Mix 1 Tbsp ground flax with 2 Tbsp water and let sit for 3-5 minutes. (Remaining 1 Tbsp flax seed is mixed with other ingredients in the blender).
In a Vitamix, blender or food processor add all ingredients, except chocolate chips. Blend/process until smooth.
Stir in chocolate chips with a spatula or spoon.
Add mixture into greased baking dish.
Bake for 30-40 minutes or until inserted toothpick comes out clean.