1. Adjust oven racks to upper-middle and lower-middle positions and heat oven to 350°F. Using kitchen shears, cut around perimeter of each pita and separate into 2 thin rounds. Combine sugar, cinnamon, and salt in bowl.

2. Working with 1 round at a time, brush cut side generously with melted butter and sprinkle with spice mixture. Stack rounds on top of one another, cut side up, as you go. Using chefs knife, cut pita stack into 8 wedges. Spread wedges, cut side up and in single layer, on 2 rimmed baking sheets. Bake until wedges are golden brown and crisp, about 15 minutes, rotating and switching sheets halfway through baking. Let cool before serving.

Serves 8