Start by trimming and halving the Brussels sprouts so they cook evenly. Toss them in a bowl with olive oil, garlic, salt, and pepper. Make sure each piece is well coated for maximum crispiness.
In a small bowl, mix Dijon mustard, honey, smoked paprika, salt, and pepper. Spread this mixture evenly over the salmon fillets. This glaze adds both flavor and a beautiful caramelized finish.
Set your air fryer to 400°F (200°C) and let it preheat for a few minutes. Preheating helps the Brussels sprouts start crisping immediately and ensures even cooking for the salmon.
Place the Brussels sprouts in the air fryer basket in a single layer. Cook them for about 5 minutes to give them a head start. Shake the basket halfway through for even browning.
Move the sprouts to the sides and place the salmon fillets in the center. Cook everything together for another 5–7 minutes. The salmon should be flaky, and the sprouts should be crispy.
Make sure the salmon reaches your desired doneness. Remove everything carefully and squeeze fresh lemon juice over the top. Serve immediately for the best texture and flavor.