Mini Nutella sandwich cookies

Ingredients

• 140 g unsalted butter, melted
• 130 g brown sugar
• 90 g white sugar
• 1 egg
• 245 g flour
• 3 g baking soda
• 200 g dark or milk chocolate chunks
• Pinch of salt
• 300 g Nutella, for filling

Instructions

1. Mix both sugars with the melted butter, then beat in the egg.
2. Fold in the flour and baking soda, then the chocolate chunks.
3. Form small dough balls of about 15 g each.
4. Chill the balls 1 hour, or overnight. Take them out 15 minutes before baking.
5. Bake 10–12 minutes at 175°C (350°F) in a preheated oven, sprinkle with a pinch of salt, and cool slightly.
6. Spread Nutella on the flat side of half the cookies, top with the rest, and enjoy.