Add Sour Cream, butter, milk, salt, and chopped chives in with the mashed potatoes and mix.
Put mashed potatoes on half of the tortilla shell and add shredded cheddar cheese on top of potatoes. Fold empty half on tortilla shell over the mashed potatoes.
Put vegetable oil or butter in frying pan or skillet and place quesadilla in pan. Let cook for about 30 seconds then flip and let other side cook for about 30 seconds. This will make the tortilla shell crispy and yummy!
If you have a quesadilla maker it makes it a little easier that cooking them in the frying pan.
If you are really in a hurry you can substitute homemade mashed potatoes with BOB EVANS sour cream and chive mashed potatoes. I've made both ways and both are delicious!
I Make these for my niece all the time, and she loves them!