Preheat oven to 350 degrees F. Lightly spray an 8 inch square pan with non-stick spray.
Whisk together the ground flax seeds and water in a small bowl, then set aside to gel.
Slice banana and place in a single row on the bottom of the square pan.
In a separate bowl, mix together the oats, brown sugar, cinnamon, ginger, nutmeg, baking powder and salt.
Add the flax seed mixture, hemp milk, maple syrup, vanilla and coconut oil. Stir together, then fold in the pepitas and hemp seeds.
Gently top the sliced bananas with the oat mixture. Place in the preheated oven and bake for 30 minutes until golden brown and set.
To serve, scoop the baked oatmeal into a bowl and top with fresh berries and more hemp milk.