This is so simple! Just cut the bread into small 1/2" squares. Spray the bread cubes liberally with non-stick spray and sprinkle with your favorite seasonings. I used garlic salt and italian seasoning. Mix the bread cubes with your hands to distribute the spices. Spray some more and sprinkle some more, if you need to.
Spread the bread cubes evenly on a cookie sheet, broiler pan, or any other flat pan that can go into the oven. Set the oven temp at 250 degrees F. Bake for about half an hour to 45 minutes. Basically bake until the bread cubes looks like croutons!