Can I make the almond cream filling ahead of time?
Yes. Prepare the almond cream mixture up to 1 day in advance and refrigerate in an airtight container. Assemble and cook the french toast just before serving.
How thick should the brioche slices be?
Cut slices at least 1 inch thick so they hold the filling without breaking and cook through to a custardy center while staying crispy outside.
What's the best way to fill the brioche without it falling apart?
Make a shallow pocket in each slice using a small knife, working carefully from the side. Spread or pipe the almond cream inside rather than overstuffing.
Can I use a different bread instead of brioche?
Brioche's richness and structure are ideal, but challah or thick white bread work as substitutes. Avoid thin-sliced bread, which won't hold the filling.
How do I know when the french toast is cooked through?
Cook over medium heat 3–4 minutes per side until deep golden brown and a fork inserted into the center meets no resistance from raw custard.