Pat scallops dry with paper towels and set aside.
In a small bowl, mix Cajun seasoning, smoked paprika, garlic powder, onion powder, thyme, salt, and black pepper.
Heat air fryer. Evenly brush olive oil over scallops, then press spice mixture into both sides.
Place scallops in a single layer in the air fryer basket. Cook at 375°F (190°C) for 6–7 minutes or until golden browned and slightly charred on top, rotating halfway.
While scallops cook, prepare the cauliflower puree: Place steamed riced cauliflower in a bowl. Add butter, chicken broth or water, and salt. Use an immersion blender or standard blender to puree until smooth. Adjust seasoning as needed.
Arrange puree on plates and top with scallops. Garnish with chives and a squeeze of lemon juice or zest. Serve immediately.