Heat 1/2 of the oil in a non-stick pan over medium heat.
Sauté the onion and zucchini until they start to soften, Then add in the chorizo and brown. Spread the cheese onto the tortilla and top with chorizo mixture then fold the tortilla in half. (Leave the leftover grease in the pan).
Place the quesadilla in the pan and cook on both sides to golden brown. Repeat for other portions.
Cut into wedges. Serve with sour cream. Garnish with cilantro.
Notes
Pro Tip - watch the heat, don't be afraid to use a lower temperature so that the outside gradually comes to a golden brown while the cheese is melting.