A french toast bake with caramelized cinnamon-sugar edges and a custardy center, made from pre-toasted stale bread so it never turns soggy.
The pre-toasting step is non-negotiable for the crisp-edge texture — do not skip it and add raw bread straight to the custard. Any stale, sturdy bread works; avoid very soft fresh bread, which turns mushy no matter what. If short on time, the 20-minute room-temperature rest is the minimum; a full overnight fridge soak gives the deepest flavor. Leftovers keep covered in the fridge for 3 days and reheat well in a 325°F oven for 10 minutes.