Croissant Paradise: A Breakfast Casserole Delight

Name: Croissant Paradise: A Breakfast Casserole Delight
Ingredients: 6 large butter croissants, halved; 8 large eggs; 1 ½ cups whole milk; ½ cup heavy cream; 2 teaspoons Dijon mustard; 6 slices thick‑cut bacon, chopped; 1 cup baby spinach, roughly chopped; ½ cup red bell pepper, diced; ¼ cup green onions, sliced; 1 cup shredded sharp cheddar cheese; ½ cup grated Gruyère cheese; ½ teaspoon smoked paprika; Salt and freshly ground black pepper, to taste; 2 tablespoons fresh chives, finely chopped