Using a bread knife, cut the bread into ½ inch by ½ inch cubes. If you prefer larger or smaller croutons, make your cuts accordingly--just be sure to make your cuts as similarly as possible to help them bake evenly. In a large bowl, toss bread cubes with enough olive oil to lightly coat. Add kosher salt, freshly ground black pepper to taste and any seasonings you prefer. Once cubes are evenly and lightly coated, pour bread onto a baking pan lined with aluminum foil (for easy clean-up).
Bake bread in oven for 20-30 minutes until bread is golden and very crunchy. Toss cubes several times during baking.
Homemade croutons, stored in a plastic container or a plastic bag, last up to two weeks unrefrigerated.