Preheat oven to 350 degrees Fahrenheit (175 C).
Cut the bread in cubes the size you prefer.
Place the cubed bread in a bowl and drizzle the olive oil over them. If you are making garlic croutons (place olive oil in a little pan with minced garlic and heat. Strain most of the garlic and then drizzle over bread cubes).
Mix gently, making sure all pieces of bread have olive oil on them.
Spread on a pan that has been lined with aluminum foil, making sure they are all in one layer. At this point if some piece of bread does not have olive oil on it, you can spritz with an olive oil mister or brush with olive oil.
Bake for about 20 minutes (checking at 15 minutes). If you are using soft (commercial) bread, bake for 8-10 minutes. Remove when golden.
Sprinkle salt and freshly ground pepper right after removing from the oven.
Store in airproof container for 3 weeks.