Preheat the oven to 175°C (hot air). Grate the carrot with a grater or in a food processor. Mash the bananas smooth with a fork in a bowl or use a food processor. We like to use the fork and not mash it completely smooth to create a bit more structure. Add the carrots to the banana and mix well.
Add the eggs one by one and beat until you have a smooth batter. Add the melted coconut oil, vanilla, and maple syrup. Mix well.
In another bowl mix the dry ingredients: oat flour, baking powder, baking soda, and all the spices. Mix well.
Add the wet mixture to the dry mixture and gently fold in until fully mixed.
Chop a few hazelnuts and add it to the batter. Pour the batter into a cake tin lined with parchment paper or greased with a bit of coconut oil. Chop a few hazelnuts in half and add on top of the batter.
Bake in the oven for 45 minutes. Take the banana bread from the oven, and brush maple syrup on top to glaze the hazelnuts. Put it back into the oven for 5 minutes. The banana bread is ready once a toothpick comes out clean. Let it cool down in the cake tin for at least 1 hour (the baking process will continue) before taking it out.