Preheat oven or toaster oven to 350 degree.
Blend the dates with the water until smooth and creamy (using a cup blender works best). Place date paste in square baking dish (8x8) along with the ripe banana and mash together well with a fork. Pour in the milk and stir together well.
Add the oats, ground flaxseed, and cacao powder, and mix together well.
Add in the chocolate chips and stir one more time to incorporate.
Spread mixture evenly across the baking dish.
Top with a sprinkle of flaked sea salt and a drizzle of tahini.
Bake for 30 minutes or until desired consistency.