In a small bowl add olive oil, garlic powder, onion powder and crushed black pepper. Give it a mix. Cut a bagel into slices and transfer it to a large mixing bowl. Pour the olive oil mixture and sprinkle rock salt. Then add the Parmesan cheese. Lightly toss and mix so that the olive oil mixture coats the bagel slices.
Preheat oven to 350 degrees F. Arrange the slices on a baking tray. Be careful to not overlap them. Place it in the oven and bake it for 15 minutes or till they turn brown and crisp. These are truly the best homemade Baked Bagel Parmesan Chips you will ever have.