Preheat the oven to 170°C.

Combine the butter and sugars using electric beaters until well combined and lightly coloured. Add the eggs, one at a time.

Add all other remaining ingredients and whisk/beat on low until well incorporated.

Line baking trays with baking paper. Shape the cookie dough into balls – each weighing around 50g. Place on the trays with room for spreading. Gently flatten each cookie to be about 1 cm thick. Poke gently in the middle of each cookie to make a small dent (not all the way through). Spoon 1-2 teaspoons of Nutella into each hole.

Sprinkle with a little sea salt.

Bake for 15 minutes. Transfer to wire racks to cool.