Season the vegetables. Add the bell peppers, onion and zucchini to a large mixing bowl. Drizzle with the avocado oil, then sprinkle the Old Bay seasoning and garlic powder evenly over the top. Toss until the vegetables are well coated. (Tip: Cutting the zucchini slightly larger than the peppers helps prevent it from overcooking in the air fryer.)

Add the sausage. Slice the chicken sausage into thin rounds and add them to the bowl with the vegetables. Toss gently until everything is evenly combined.

Air fry. Preheat the air fryer to 390°F if your model requires it. Add the sausage and vegetables to the air fryer basket in an even layer (work in batches if needed so the basket isn’t overcrowded). Cook for 9–11 minutes, shaking the basket halfway through, until the vegetables are tender and lightly browned and the sausage is heated through.

Finish and serve. Transfer the sausage and vegetables to a serving dish and squeeze fresh lemon juice over the top. Serve warm with extra lemon wedges if desired.