Prep the air fryer: Preheat your air fryer to 390°F (200°C) for about 3–5 minutes. Lightly spray the basket with olive oil to prevent sticking.
Mix the base: In a bowl, combine the egg, mayonnaise, Dijon, lemon zest, lemon juice, Old Bay, pepper, and a small pinch of salt. Whisk until smooth.
Add the salmon and veggies: Fold in the flaked salmon, onion, bell pepper, and herbs.
Add the breadcrumbs and gently mix until the mixture holds together when pressed. If it’s too wet, add a tablespoon more breadcrumbs; if too dry, add a teaspoon of mayo or lemon juice.
Form the croquettes: With slightly damp hands, shape the mixture into 8 patties about 2.5 inches wide and 1/2 inch thick. Press firmly so they don’t crumble.
Chill briefly (optional but helpful): For easier handling, place the patties in the fridge for 10 minutes.
This helps them hold their shape in the air fryer.
Air fry the first side: Arrange patties in a single layer in the basket, leaving space between them. Lightly spray the tops with oil. Air fry for 6–7 minutes.
Flip and finish: Carefully flip the croquettes, spray again, and cook another 4–6 minutes until golden and crisp.
Internal temperature should reach 145°F (63°C).
Serve: Squeeze fresh lemon over the top and serve hot with your favorite sauce and a simple side salad or roasted veggies.