Step 1Heat the oven to 200 degrees. Line several baking sheets with foil.
Step 2Slice the bagels crosswise into 1/4-inch-thick rounds or planks. Arrange in a single layer on the baking sheets. Using a spray mister, lightly coat the tops with the olive oil. (You also can brush on the oil with a pastry brush, but you'll need to use a bit more oil and the chips will not be as crisp.)
Step 3Generously sprinkle the chips with equal amounts of the onion powder, garlic salt and seasoned salt.
Step 4Bake until crisp and cracker-like, 45 minutes. Store in a tightly covered container for up to a week.