This easy Overnight Breakfast Strata Recipe is made with cheese and spinach to create a delicious, fluffy breakfast strata that is perfect for a holiday breakfast or weekend brunch.
• chopped frozen spinach • unsalted butter • yellow onion • kosher salt and pepper • roasted red peppers • milk • heavy cream • grated nutmeg • Dijon mustard • eggs • cooking spray or butter • Sourdough • Gruyere or Swiss Cheese • Parmesan cheese