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Preheat oven to 425 degrees. Split ciabatta lengthwise; dice into ½-inch cubes. Spread out on a baking sheet. Bake on top rack until slightly dried out, about 7 minutes. Toss bread and continue to bake until crisp but not yet deeply browned, 7-9 minutes more. (Store toasted ciabatta uncovered at room temperature until ready to use. Covering creates moisture, which turns the bread soggy.)