Preheat convection oven to 200°C (400°F).
In a 3-liter ceramic baking dish, combine chicken strips, julienned peppers, and sliced onions.
Incorporate olive oil and fajita seasoning, tossing manually to ensure uniform surface coverage.
Distribute the mixture into an even layer to ensure consistent thermal contact.
Bake for 20 minutes or until chicken reaches an internal temperature of 74°C (165°F).
Remove from oven and apply shredded cheese across the surface of the mixture.
Return to oven for 5 minutes until cheese is fully melted and slightly golden.
Rest for 5 minutes at room temperature before serving.