Preheat your air fryer to 380°F (193°C) for 2-3 minutes. Yes, preheating matters—it helps get that nice sear on your food from the moment it goes in.
Prep your ingredients while the air fryer heats up. Slice your sausages and chop all the vegetables into roughly the same size (about 1-inch pieces) so everything cooks evenly.
In a large bowl, combine the sliced sausages and all vegetables. Drizzle with olive oil and sprinkle with Italian seasoning, garlic powder, paprika, salt, and pepper. Toss everything until evenly coated. If using balsamic vinegar or lemon juice, add it now.
Add the mixture to your air fryer basket, spreading it out in as much of a single layer as possible. Don't panic if there's some overlap—we're going for "not completely piled up" rather than "perfectly arranged."
Cook for 8-10 minutes, shaking the basket or stirring halfway through. The veggies should be tender with some golden brown spots, and the sausage should be heated through with a slight caramelization.
Check for doneness. If you like your vegetables more charred, cook for an additional 1-2 minutes.
Transfer to plates or a serving dish, sprinkle with fresh herbs if using, and serve immediately.