Monte Cristo Croissant Casserole

Name: Monte Cristo Croissant Casserole
Ingredients: 7 large eggs; 1 1/3 cups half-and-half; 4 teaspoons Dijon mustard; 1 1/2 teaspoons kosher salt; 1/2 teaspoon black pepper; 8 slices deli smoked ham (1/4-inch thick); 8 slices deli smoked turkey (1/4-inch thick); 8 slices Swiss cheese; 8 day-old croissants , halved horizontally; Cooking spray; 2 tablespoons seedless raspberry jam; 1 tablespoon pure maple syrup; Powdered sugar