In a small bowl, mix chili powder, coriander, and garlic salt.
Split pocket breads apart to make 8 rounds. Lay rounds, rough side up and slightly apart, on two 12- by 15-inch baking sheets. Brush tops lightly with vinegar; sprinkle evenly with spice mixture.
Bake in a 375° regular or convection oven until rounds are crisp and lightly browned, 8 to 10 minutes. Serve warm or cool.