Split each pita in half horizontally to form 2 rounds. Brush rough sides of pita halves with oil. Combine pepper, salt, and cumin; sprinkle evenly over pita halves. Cut each pita half into 8 wedges. Arrange, rough side up, in a single layer on a baking sheet. Bake at 375° for 14 minutes or until browned at edges and crisp.