Croque Monsieur Casserole - Eggs.ca

Ingredients

• 4 eggs
• 1 1/2 cups milk
• 1/2 cup finely grated Parmesan cheese, divided
• 2 tbsp finely chopped fresh chives
• 1 clove garlic, minced
• 1/4 tsp each salt and pepper
• 2 tbsp Dijon mustard
• 12 slices day-old Italian loaf (about 3/4-inch/2 cm thick)
• 12 slices ham
• 1 1/2 cup shredded Gruyère cheese, divided
• 3 cups baby spinach