In a shallow bowl mix eggs, milk nutmeg, cinnamon, and vanilla extract until well incorporated.
Heat a griddle pan on high and place the butter in the pan. Reduce the heat to medium once the butter is melted. Place each slice of croissant in the egg/milk mixture quickly covering both sides and place croissants in the pan. Cook on each side for about 5 minutes or until golden brown (*Remember to flip the croissants over half way through).
For the Topping:
Melt butter in a sauce pan on medium-high heat. Add the brown sugar and walnuts; stir. Then add slices of bananas on top of the mixture. Cook for about 20-30 seconds and then carefully turn the bananas. Then add the orange juice and cinnamon and cook for an additional 30 seconds.
Place the cooked croissant french toast on a plate and top with banana and walnut topping. Lastly, drizzle some of the sauce on top. Enjoy.