Preheat your oven at 375 degree Fahrenheit and prepare your 8 inch square baking pan with a parchment paper.
In your food processor/grinder combine hemp seeds and grind until it’s in a powder form.
Next, in your large mixing bowl combine mashed banana, vanilla extract and olive oil.
On the side, in another large mixing bowl combine hazelnut meal, baking powder and salt. Then, mix it well with a spoon until no lumps are left.
Now, fold in powdered hemp seeds into hazelnut mixture.
Then fold in banana mixture and soaked chia seeds into hazelnut mixture.
Thereafter, mix the batter extremely well with a spatula.
Afterwards, spoon the batter into the prepared baking pan and spread it gently yet evenly in the pan.
Lastly, place the pan in the middle rack of the oven and bake it for 30 minutes.
Next, take out the pan and let it cool completely (may take about 20 minutes)
Finally, cut it into desired pieces and enjoy.