Ham and Cheese Croissant Strata

Name: Ham and Cheese Croissant Strata
Ingredients: 6 large croissants (preferably day-old, torn into bite-sized pieces); 1 ½ cups cooked ham (diced (or substitute with bacon, turkey, etc.)); 2 cups shredded Gruyère (Swiss, or cheddar cheese (or a mix)); 6 large eggs; 2 ½ cups half-and-half (or whole milk); 1 tablespoon Dijon mustard; 1 teaspoon garlic powder; 1 teaspoon onion powder; Salt and pepper to taste; 3 tablespoons everything bagel seasoning; 2 tablespoons butter (melted); Fresh herbs (optional, for garnish)