Preheat the oven to 350 and line a large cookie sheet with greaseproof paper and set aside.
Prepare two large mixing bowls- In bowl one, combine the Nutella, half the granulated sugar and one egg, and mix until combined. In bowl two, combine the peanut butter, remaining sugar and egg and mix until combined.
Using your hands, form small 2-inch balls with each kind of dough. Once completed, get one of each kind and press them lightly together, then place on the lined cookie sheet. Press each one down with a fork.
Bake for 10-12 minutes, until lightly golden brown but still soft. Remove from the oven and allow to cool on the baking sheet for 10 minutes before transferring to a wire rack to cool completely
Notes
Cookies will seem undercooked once removed but firm up nicely. If you take it out when firm it will be much crispier.