Cook or prep the chicken: If using raw chicken breast, season lightly with salt and pepper. Sear in a lightly oiled skillet over medium heat, 5–7 minutes per side until cooked through (165°F/74°C).
Let rest, then chop or shred. If using rotisserie chicken, remove skin and shred the breast meat.
Make the ranch dressing: In a bowl, whisk Greek yogurt, ranch seasoning, lemon juice, and Dijon. Add a splash of water or milk until it’s creamy and spreadable.
Adjust salt and pepper to taste.
Toss the chicken: In a large bowl, combine the chicken with about half of the ranch dressing. Stir to coat. Add more dressing if you like it creamier, reserving a little for drizzling.
Prep the veggies: Shred the lettuce and dice the tomato and cucumber.
Slice the red onion thin so it doesn’t overpower.
Warm the tortillas: Heat each tortilla in a dry skillet for 10–15 seconds per side, or microwave under a damp paper towel for 20 seconds. Warm tortillas roll without tearing.
Assemble the wraps: Lay a tortilla flat. Add a layer of lettuce, then a generous scoop of ranch chicken.
Top with tomato, cucumber, and onion. Sprinkle cheese if using. Drizzle a bit of extra ranch.
Roll it tight: Fold the sides inward, then roll from the bottom up into a snug wrap.
For a grilled finish, place seam-side down in a hot skillet or panini press for 1–2 minutes per side until lightly crisp.
Serve: Slice in half on the diagonal. Add cracked black pepper or a squeeze of lemon if you like a fresh pop.