Cut slices of Cinnamon Swirl bread in half.
Melt butter and pour into the bottom of a 9x 13 baking dish. In a small bowl, mix the brown sugar, cinnamon and nutmeg.
Whisk the eggs, milk and vanilla together in a separate bowl. Layer bottom of baking dish with half the bread slices. Sprinkle half of the brown sugar mix over the bread.
Layer second half of bread on top of brown sugar mix. Pour egg mixture over the bread slices, making sure all are covered evenly. Sprinkle remaining brown sugar mix on top.
Cover with aluminum foil and refrigerate overnight.
In the morning, remove from the refrigerator and cover with a new piece of foil. Preheat oven to 350 and bake the casserole for 30 minutes.
Uncover and bake for an additional 15 minutes until the French toast casserole is brown on top.
Pour maple syrup on top of casserole. Place back in the oven and using your ovens broiler, broil for about 5-7 minutes to caramelize the top.
Sprinkle powdered sugar on top. Serve warm. It goes great with a hot cup of coffee!
