Preheat oven to 350°F (175°C) and grease a 9x5 inch loaf pan with non-stick spray.

Whisk together flour, protein powder, cocoa powder, sweetener, baking powder, and salt in a large mixing bowl.

In a separate bowl, combine almond milk, eggs, melted coconut oil, and vanilla extract until smooth.

Incorporate the wet mixture into the dry ingredients using a spatula until just combined.

Fold in the chocolate chips evenly.

Transfer half of the batter into the prepared loaf pan.

Distribute small dollops of Nutella across the batter surface and swirl using a toothpick or knife.

Spread the remaining batter on top and add remaining Nutella for a decorative swirl.

Bake for 45 to 55 minutes or until an internal temperature of 200°F is reached or a tester comes out clean.

Cool in the pan for 10 minutes before transferring to a wire rack for complete cooling.