Fire up your belgian waffle iron (we like ours on medium-high heat).
In a large bowl, sift together the dry ingredients (flour, corn starch, sugar, baking soda, and salt).
Pour the buttermilk, oil, and egg into the dry mixture and stir to combine.
Place your nutella in a small bowl and microwave in 30-second increments until nice and runny.
Spray your hot waffle iron with non-stick vegetable oil spray.
Pour waffle batter into the waffle iron and drizzle the melted Nutella mixture over the top in a swirl as quickly as you can.
Close lid of the waffle maker and let your waffle cook according to your waffle iron instructions, until golden brown waffles emerge.
Serve immediately, so that you can best enjoy the amazing caramelized, crunchy and melty nutella bits embedded in your delicious waffles.