Prepare the crisps: Slice the potatoes as thin as possible (about 0.3 mm). Toss them with vegetable oil and season generously with salt and pepper.
Heat your air-fryer to 195°C. Arrange the potato slices in a single, even layer in the basket (you may need to cook in batches). Fry for 10–15 minutes per batch, until golden and crispy. Remove and set aside on paper towels to drain.
Make the dip: In a mixing bowl, combine caramelised onion chutney, chopped shallot, soured cream, garlic powder, onion powder, celery salt, Worcestershire sauce. Stir well.
Add a squeeze of lemon juice, season with salt and pepper to taste, then fold in the sliced spring onion. Chill the dip for at least 30 minutes to let flavors meld.
Serve the chilled dip with the warm air-fryer crisps. For extra flair, sprinkle some crispy fried onions and chopped chives on top before serving.