Heat a skillet over medium with the oil. Once hot, add the bell peppers and cook for 2-3 minutes until they begin to colour. Add the white scallions, garlic, dried spices, salt and pepper, and stir for an additional 1-2 minutes before removing from the heat and stirring in the chicken.
Add the mixture to a large bowl with the sour cream, beans, and cheese. Stir until the mixture is evenly combined.
Preheat your oven to 220c/200 fan and oil a large baking tray.
Lay out 9-10 of the tortillas to cover the entire bottom of the baking tray. I do this by slightly overlapping them and hanging them off of the edges to fold over later. Spread your filling evenly across the tortillas. Once filled, place the remaining tortillas in the centre on top of the filling and begin to fold your tortillas over the top. Your goal is to be left with one big filled pocket. You can hold the tortillas in place with toothpicks.
Cook the quesadilla sheet pan for 20 minutes with another pan on top for weight before taking it off and cooking for an additional 5 mins.
While the quesadilla is baking, blend the avocado crema ingredients together in a food processor until smooth.
Serve the quesadilla with the crema, green scallions, extra coriander, and your favourite salsa.