Holiday Leftover Breakfast Casserole

Ingredients

• 8 large eggs
• 2 1/2 cups whole milk
• 1 tablespoon Dijon mustard
• 1 tablespoon fresh parsley, minced, plus more for garnish
• 1 tablespoon fresh chives, minced, plus more for garnish
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1/4 teaspoon paprika
• 6 cups leftover slightly-stale french or italian bread, cut into 1/2” cubes
• 1 pound leftover baked ham, cut into small cubes
• 1 cup sharp white cheddar, shredded
• 1/2 cup Gruyere cheese, shredded