Chicken Florentine Strata

Ingredients

• 2 tbsp olive oil
• 2 shallots, minced
• 1 1/2 lb boneless, skinless chicken breast halves, sliced into thin strips
• 1 tsp salt
• 1/2 tsp black pepper
• 1/4 tsp cayenne pepper
• 10 oz frozen spinach, thawed and well-drained
• 1 cup sun-dried tomatoes, drained and chopped
• 10 slices white bread, cut into cubes
• 2 cups Monterey Jack cheese, grated
• 6 eggs
• 2 cups whole milk
• 2 tsp Dijon mustard
• 1/4 tsp nutmeg