French Apple-Raisin Sandwiches

In a large baking dish , whisk eggs, milk, and cinnamon . Set aside. Place the bread slices in the egg mixture. Let soak until the egg mixture is completely absorbed into the bread, turning over occasionally, for 1 to 2 minutes. Heat a griddle over medium low heat. Add the butter and melt. Cook the bread on the griddle until brown and heated through, about 2 to 4 minutes per side. Make 2 sandwiches with the bread and apple pie filling. Cut each sandwich in half. Transfer to plates and serve with additional butter . Top with powered sugar, if desired.