Step 1: Prep the Baking Dish - Grease a 9"x13" baking dish with butter or cooking spray.

Step 2: Cube Bread - Cut the brioche bread into 1-inch cubes.

Step 3: Layering - Spread half of the bread in the dish, then layer with turkey, roast beef, and half the Swiss cheese.

Step 4: Custard Mixture - Whisk together eggs, milk, maple syrup, and spices until evenly mixed.

Step 5: Combine - Pour custard mixture over the bread layers and gently press down.

Step 6: Chill - Cover with plastic wrap and refrigerate for at least 4 hours or overnight.

Step 7: Bake - Preheat oven to 350°F and bake uncovered for 45-50 minutes.

Step 8: Rest and Serve - Let cool for 10 minutes, dust with powdered sugar, and serve with fruit preserves.