01 -
Set oven rack in the middle position. Preheat oven to 95°C. Position a wire rack within a rimmed baking sheet.
02 -
Slice the uncut loaf crosswise into 2–2.5 cm thick slices.
03 -
In a 23x33 cm baking dish, whisk together eggs, milk or cream, sugar, vanilla extract, ground cinnamon, and kosher salt until fully blended and sugar has dissolved.
04 -
Arrange a single layer of bread slices in the custard mixture. Soak, turning once, for 1 minute per side (white bread) or 15 seconds per side (challah/brioche) until thoroughly saturated but not falling apart. Place soaked slices on the wire rack. Repeat with remaining bread.
05 -
Melt 15 g butter in a large nonstick skillet over medium heat. Add bread slices in a single layer with space around each. Cook until the underside is golden brown and crisp, 3–4 minutes. Flip and cook the other side for 2–3 minutes until browned. Lower heat to medium-low if needed to prevent overbrowning.
06 -
Transfer cooked slices to a second baking sheet and keep warm in the oven.
07 -
Melt an additional 15 g butter prior to each new batch. Continue until all bread slices are cooked.
08 -
Serve warm, optionally topped with butter, maple syrup, or dusted with powdered sugar.