Preheat your oven to 350°F (175°C). Grease and flour a standard loaf pan or line it with parchment paper for easy removal.
In a large mixing bowl, whisk together the dry ingredients: all-purpose flour, almond flour, sugar, salt, and baking powder. Make sure they are thoroughly combined.
In a separate bowl, mix the pumpkin puree, light olive oil, and almond milk. Stir until the mixture is smooth and well incorporated.
Gradually add the pumpkin mixture to the dry ingredients. Stir gently until you have a smooth batter. Avoid overmixing.
Drop Nutella onto the batter and use a spatula to gently incorporate the Nutella into the batter using a folding motion. KEEP IN MIND that the marbling effect is achieved by not fully mixing the Nutella into the bread batter. The goal is the keep the chocolate streaks visible in the batter.
Pour the batter into the prepared loaf pan and spread it evenly.
Sprinkle the chopped hazelnut on top of the batter
Bake the Pumpkin Bread Loaf in the preheated oven for about 50-60 minutes or until a toothpick inserted into the center comes out clean.
Once baked, remove the loaf from the oven and allow it to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.
Slice and enjoy
You can also make it pretty by piping Nutella Frosting on top of the baked pumpkin loaf.