On a large baking sheet, spread out the bread cubes into one layer. Evenly sprinkle the Italian seasoning, garlic powder, and salt over top. Then drizzle the olive oil over top as well.
Using your hands, toss to combine thoroughly and then spread back into one even layer.
Bake for 14 to 16 minutes or until golden brown. The croutons will harden as they cool. For maximum crispiness, use right away rather than storing for another day.