Slice stale sourdough brioche into 3/4 inch / 2 cm slices. Bake it on low for a bit if it's not stale enough.
4 slices brioche
In a medium bowl, whisk the eggs and add the maple syrup, milk, melted butter, and vanilla extract. Combine all wet ingredients well.
1 egg, 1/3 cup milk, 1 tbsp butter, 2 tbsp maple syrup, 1 tsp vanilla extract
While whisking, add the flour and cinnamon. Mix everything thoroughly until you have a smooth batter.
1/2 cup all-purpose flour, 1/4 tsp ground cinnamon
Dip a slice of the sourdough brioche into the batter for 30-60 seconds. Make sure it doesn't get too soggy.
4 slices brioche
In a medium frypan, melt 1 tsp of butter on medium-low heat. Add the soaked slices to the frying pan and bake each side for 1-2 minutes or until golden brown. Remove the slice from the pan and repeat the process for all other slices.
1 tbsp butter
Serve with fresh or frozen raspberries, a dollop of greek yogurt, and a generous drizzle of maple syrup.
1/2 cup raspberries, 1/2 cup Greek yogurt, 2 tbsp maple syrup
Notes
The batter should have the consistency of thick, wet paint. Add a dash more milk if it's too thick.If you're using stale sandwich bread instead of brioche, make sure to soak the bread for longer.Use a medium-low heat when cooking the French toast or it will burn easily when cooked in butter. Cook until the toast turns golden brown and the batter starts to crisp up and caramelize.Storage: Leftover French toast can be stored in an airtight container in the fridge for up to 2 days and reheated.