Part of what makes quesadillas from Taco Bell so different and delicious is the creamy jalapeño sauce they put inside! Look no further and you'll find the perfect copycat!
Prepare creamy jalapeno sauce by combining all ingredients in a small bowl. Cover and chill to develop flavors. Stir occasionally.
Heat skillet to medium. Rub chicken with vegetable oil. Salt and pepper both sides of the chicken and cook until no longer pink. Slice very thin.
Prepare a skillet over medium-low heat. Once hot, lay one tortilla in pan. Arrange cheddar cheese, then jack cheese on half of the tortilla. Tear up the American Cheese slices and arrange it on top of the other cheese. Top with chicken and then spread sauce on the other half.