Line a baking sheet with wax paper. Form 1 tablespoon balls of Nutella and place on the prepared baking sheet. Freeze for at least 15 minutes.
Preheat the oven to 350˚F. Lightly spray two baking sheets.
In a medium bowl, mix together the flours, sugar, cornstarch, baking powder and sprinkles.
In a separate bowl, mix together the eggs, oil and vanilla until fully combined.
Slowly mix in the wet ingredients to the dry ingredients, and mix until fully incorporated.
Scoop a tablespoon of cookie dough and flatten in your hands. Place the frozen Nutella ball in the centre of the flattened cookie dough. Wrap the dough around the Nutella ball and press to seal.
Place the cookies on the prepared baking sheet, and bake for 9-10 minutes. Allow cookies to cool on the baking sheet.