Combine the tuna, yogurt, chopped onions, basil, and sweetcorn in a bowl, seasoning it to taste with salt and pepper.
Lay out the wrap and place a generous amount of spinach in the middle. Spoon the tuna mixture over the spinach and sprinkle with grated cheese. Fold the wrap securely into a bundle.
Lightly coat with oil spray. Cook in an air fryer or on a frying pan for 6-8 minutes at 200°C with a fan setting, until it achieves a crispy, golden-brown finish.
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