Preheat your oven to 375°F (190°C).
In a large bowl, combine the cubed French bread, olive oil, garlic powder, salt, and black pepper. If using, add the dried herbs.
Toss until the bread cubes are evenly coated.
Spread the bread cubes in a single layer on a baking sheet.
Bake in the preheated oven for 10-15 minutes, stirring once halfway through, until the croutons are golden brown and crispy.
Let the croutons cool completely before serving or storing in an airtight container.