Your french toast recipe with brioche bread is likely to be soggy if it’s underbaked, so make sure to give it more baking time if it doesn’t appear lightly golden brown on top. Your casserole could also be soggy if you’re using too much liquid. The amount of liquid in this egg casserole with brioche bread works for a full loaf of brioche, so you may need to use less milk if your loaf is small or if you’re not using a full loaf.