Gather all the ingredients on a clean surface.
Lay one tortilla flat on a plate.
Spread mayonnaise and mustard evenly over the tortilla.
Add a layer of shredded lettuce in the center.
Place sliced cooked chicken on top of the lettuce.
Sprinkle diced tomatoes over the chicken.
Top with shredded cheese.
Season with salt and pepper to taste.
Carefully fold the sides of the tortilla inward.
Roll the tortilla tightly from the bottom to the top.