Make dip: Stir together all ingredients; chill.
Make chips: Preheat oven to 375°F. Cut each pita in half, then cut each half into three wedges. Transfer to a bowl, drizzle with oil and sprinkle with salt and pepper.
Divide pita between two baking sheets. Bake, rotating pans midway through cooking, until light brown and crisp, 10 to 12 minutes. Let cool.