If convenient, freeze your loaf of sliced bread at least overnight. When you are ready to make your croutons, separate out as many slices of bread as you need. Now, spread both sides of frozen bread slices with a thin layer of butter. (You may leave the butter off, if you are watching fat and calories.) As the bread is buttered, you may add garlic powder, dried herbs, etc. to fit your taste, although these are very good plain. Next, (while the bread is still frozen, use a knife to slice vertically and horizontally, forming cubes of buttered, frozen bread. Place the cubes in a single layer in a shallow baking pan. Use more than one pan, if needed. Bake for about 15 minutes, stirring every 5 minutes. Watch closely, so that the croutons do not get overly brown. When the croutons are golden and crisp, remove them from the oven. Let cool. Place in a tightly covered container to store. Use as desired, with salads or in other recipes! These taste outrageously delicious!