Air Fry the Chickpeas or Vegetables: Preheat the air fryer to 375°F (190°C). Toss chickpeas or chopped vegetables in olive oil, salt, and pepper. Air fry for 8-10 minutes, shaking the basket halfway through to ensure even cooking.
Prepare the Salad Ingredients: While the chickpeas or vegetables are cooking, slice the cucumber, tomatoes, red onion, and olives. Place them in a large mixing bowl. Flake the tuna and add it to the bowl with the vegetables.
Prepare the Dressing: In a small bowl, mix the Greek yogurt, Dijon mustard, and lemon juice. Stir until well combined, then season with salt and pepper to taste.
Assemble the Salad: Once the chickpeas or vegetables are done, remove them from the air fryer and allow them to cool slightly. Add the air-fried elements to the salad, then drizzle with the prepared dressing. Toss everything gently to combine.
Serve and Garnish: Plate the salad, garnishing with fresh herbs like parsley or dill. Serve immediately or refrigerate for later.