Place one tortilla on a flat surface. On one half of tortilla, place some chicken, cheese, and salsa. Fold tortilla over.
Set a frying pan on medium to low heat.
Place folded tortilla on frying pan and allow to heat all the way through. After a couple of minutes carefully flip over and cook until cheese is nice and melted.
Be careful not to burn the tortilla! You'll need to adjust heat accordingly.