Cover your pan with foil and cooking spray and set aside.
Mix the first 4 ingredients in a bowl until combined.
Spoon decent portions of the chicken mixture into your tortillas. Add a liberal pile of cheese and spinach.
Fold the left and right sides of the tortillas into the middle and then fold the bottom flap over the two sides and roll it away from you to close the burrito (you'll be rolling it onto the remaining top flap to close it).
Place each burrito onto your pan and sprinkle each one with a bit of cheese if desired.