Combine french toast egg mixture and dip sliced bread into it, totally immersing bread and covering both sides. Remove and place on a baking sheet. Repeat with remaining slices. Allow bread to sit for 5-7 minutes.
Cook on a medium heat griddle that has been sprayed with cooking spray until golden brown.
Combine all ingredients, using fingers to make sure butter is evenly distributed.
Place on a parchment lined baking sheet and bake at 350 degress F for about 10 minutes. Stirring several times to prevent it from burning.
Remove from oven when golden brown and allow to cool.
Sprinkle over french toast and drizzle with maple syrup if desired.
Brioche French Toast with Walnut Crumble was originally written by Leigh Anne Wilkes at https://www.yourhomebasedmom.com/brioche-french-toast/.