Preheat oven to 170°C. Line a 9 x 13" baking dish with parchment paper.
Mix all dry ingredients in a bowl and set aside.
Mix all wet ingredients in a large bowl. Add dry mixture and mix until just combined.
Pour batter into prepared baking dish en bake for 25-30 minutes. A toothpick inserted in the middle should com out clean.
Enjoy as is or frost as desired.
* If you have a bit more pumpkin and/or mashed banana, you might need to up the amount of ground almonds or oat flour.
** Use certified gluten free is necessary.