01 -
Crank your oven up to 175°C. While the oven gets hot, take your chilled casserole out of the fridge and set it on the counter for 15 minutes so it can warm up a bit. Pop it in without any cover and bake for 35–40 minutes until the middle still jiggles a little but the edges are crispy and the top turns golden.
02 -
Wrap your baking dish really well with plastic, then stash it in the fridge for at least 4 hours, or even overnight. This way, the bread sucks up all the custard goodness.
03 -
Mix up your eggs, milk, vanilla, salt, and (if you like) cinnamon in a bowl until it looks frothy and everything’s blended. Pour it evenly on the bread you already set on the caramel base, making sure every last bit of bread is soaking. Press it down gently so it can soak up more of the creamy mix.
04 -
Take those slices of French bread and lay them over the caramel in the baking dish. Let them overlap a tiny bit so they fit nice and snug.
05 -
Melt together butter, brown sugar, and corn syrup in a tiny pot on medium heat. Keep stirring here and there. Once it's bubbling and the sugar melts (about 3–4 minutes), dump that yummy caramel into your baking dish and try to spread it out as evenly as you can.
06 -
Let things cool off just a bit. When you're ready to serve, flip over each piece so the sticky caramel side faces up. Eat while it's still warm and, if you like, finish with berries or some powdered sugar on top.