In a medium bowl, mix the shredded chicken, pesto, and mayo or yogurt until well combined.
Lay out each tortilla and layer with a handful of spinach.
Spoon the chicken pesto mixture on top.
Add any extras like cheese or tomatoes if you’d like.
Wrap tightly like a burrito. If you want it warm, toss it in a pan or air fryer for 2–3 minutes to get that golden, toasty edge.
Slice in half and serve immediately—or wrap in foil for later.