To make dry bread cubes, preheat oven to 300°F. Cut 8 ounces French bread into 3/4-inch cubes (should yield 6 cups). Spread into a 15x10x1-inch baking pan. Bake for 10 to 15 minutes or until dry, stirring twice; cool. (Cubes will continue to dry and crisp as they cool.) Or let bread cubes stand, loosely covered, at room temperature for 8 to 12 hours.
To Make Ahead:
Prepare as directed, except do not bake. Chill for up to 24 hours. Preheat oven to 350°F. Bake, covered, for 45 minutes to 1 hour or until heated through.