Air-Fryer Portobello Burgers with Thousand Island Aïoli

Make Thousand Island Aïoli: In a small food processor place cashews, ketchup, and chopped onion. Cover and process, gradually adding 3 to 4 Tbsp. plant milk until aïoli is smooth and about the consistency of mayonnaise. Stir in relish. Set aside. 2. Preheat air fryer to 390°F. In a shallow bowl stir together panko, nutritional yeast, garlic powder, onion powder, and paprika. Place ⅓ cup plant milk in a second shallow bowl. 3. Dip portobello mushrooms in plant milk and then panko mixture, lightly coating all sides. Place mushrooms gill-side down in a single layer in air fryer. Air-fry 7 to 9 minutes or until mushrooms are tender and breading is crisp. Transfer mushrooms to a platter. 4. Add separated hamburger buns to air fryer, in batches if necessary. Air-fry 1 to 2 minutes or until lightly toasted. Repeat until all buns are toasted. Fill buns with lettuce, burgers, tomato slices, and Thousand Island Aïoli.