In a small non-stick skillet, heat 1 table- spoon of oil over medium heat. Add spinach and cook, stirring, until soft, about 1 minute.
Top with 1 tortilla, and top with 2 tsp cheese, spinach and remaining 2 tablespoons cheese. Cover with another tortilla.
Heat the remaining 1 tsp oil in a frying pan over medium heat. Add the quesadilla and cook, turning once, until crisp, about 4 minutes.
Top the quesadilla with potatoes and avocado. Add hot sauce if desired.