Transfer cut bread cubes to a 9x13 rimmed baking tray.
Drizzle with olive oil, garlic powder, and salt and toss to coat. Spread the bread out in an even layer.
Bake on the center rack, tossing cubes twice during cooking until edges are just golden. About 12 to 15 minutes. Just keep an eye on yours.
Serve croutons warm if desired or cool to room temperature. Store in an air tight container for up to one day and re-heat in the oven to crisp again if needed.