- Preheat oven to 350°.
- In a large bowl, toss cubed bread with butter until evenly coated.
- Add in salt, pepper, garlic powder, onion powder, and rosemary, and toss to combine until evenly distributed.
- Divide seasoned bread between two large baking sheets.
- Bake until golden and crispy, flipping halfway through, about 15 minutes total.