Eggs Florentine Breakfast Casserole - Brioche Gourmet

Ingredients

• 9 Brioche Gourmet Brioche Rolls, cubed
• Nonstick cooking spray
• 8 slices thick-cut bacon, chopped
• 1 package (10 ounces) chopped frozen spinach, thawed and squeezed dry
• 1 cup shredded Parmesan cheese
• 1 cup shredded Swiss cheese
• 8 large eggs
• 1 1/2 cups whole milk
• 1 tablespoon Dijon mustard
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• Chopped fresh chives for garnish (optional)