In a small bowl, combine Greek yogurt, minced chives, garlic powder, and black pepper to create the spread.
Lay the tortillas flat on a clean work surface.
Spread an even layer of the yogurt mixture over the entire surface of each tortilla.
Layer the cheese slices in the center of each tortilla.
Place the sliced turkey breast over the cheese, covering most of the surface.
Top with a layer of baby spinach leaves.
Roll each tortilla tightly into a cylinder shape.
Use a sharp serrated knife to slice the rolls into 1-inch thick rounds.
Serve immediately or refrigerate in an airtight container.