In a small bowl, whisk together the granulated sugar and ground cinnamon until they are evenly combined. Set this mixture aside for later use.
Stack your tortillas on a cutting board. Using a pizza cutter or a sharp knife, cut the stack into triangles. You can cut each tortilla into 8 wedges, similar to how you would slice a pizza.
Place the tortilla triangles into a large mixing bowl. Drizzle the melted butter over the chips and toss gently with your hands or a spatula to ensure every piece is lightly coated. Alternatively, you can lay them flat and use a pastry brush. Sprinkle the cinnamon sugar mixture over the chips and toss again until they are well-coated.
Preheat your air fryer to 350°F (175°C). Place the tortilla pieces in the air fryer basket in a single layer. It is okay if they overlap slightly, but try not to crowd them too much to ensure maximum crispiness. You may need to work in batches depending on the size of your air fryer.
Cook the chips at 350°F (175°C) for 5 to 7 minutes. Around the 3-minute mark, open the basket and shake it or flip the chips with tongs to ensure even browning. Keep a close eye on them during the last two minutes, as they can turn from golden to burnt very quickly.
Remove the chips from the air fryer. They may feel slightly soft at first, but they will crisp up significantly as they cool. Let them rest for 2 minutes before serving.