The best bread for French toast depends on your preferences. The breakfast is commonly made with brioche, challah, sourdough, French bread, or plain old white bread. I used whole-grain bread to make the recipe healthier and higher in fiber.  When you're shopping for whole-grain bread, the first ingredient should be whole-grain flour, whole-wheat flour, or another whole-grain ingredient. It should not, for example, be enriched wheat flour.