In a pan heat the oil, add pork and cook on low-medium heat for 5 minutes. Add mushrooms and taco seasoning. Add salt and pepper if preferred. Cook for another 15 - 20 minutes. When meat is ready turn off the heat.
Take one tortilla and put some meat and mushroom on it, put 3 slices of cheese nicely. Cover with another tortilla and cook on George Foreman Grill for about 5 - 10 minutes. It can be also baked in the oven or in the pan. When the cheese melted and quesadillas are crisp, they are ready.
Serve with salad, avocado and a dollop of sour cream or greek yogurt.