1Melt dark chocolate with butter in a double boiler or microwave, then let cool slightly.
2In a large bowl, beat eggs with sugar until light and fluffy.
3Gently fold in the chocolate-butter mixture, then sift in flour, baking powder, and salt, mixing until just combined.
4Add speculoos paste and chopped pecans, stirring until evenly distributed.
5Divide the batter evenly into cupcake liners placed in an air fryer-safe pan or small ramekins.
6Place in preheated air fryer at 160°C (320°F) and bake for 12–15 minutes, until a knife inserted in the center comes out clean.
7Let cupcakes cool completely before removing from the pan. Optionally, decorate with a pecan half and a drizzle of speculoos paste.