Heat olive oil in a large skillet at medium-low heat.
Place one tortilla sheet on the pan, then top with chicken, mango, spring onion, tomato, avocado and cheese.
Season with salt and pepper to your taste, then cover with a second tortilla.
Cook until golden-brown, about 3 minutes. Flip it on the other side, using a spatula (it might get messy the first time, but you'll get better in time :) ) and cook for an additional 2 minutes.
Drizzle with your favorite sauce and garnish with green onions.