Spinach and Roasted Bell Pepper Strata

Last week, we decided to make a strata for Saturday brunch.  The ingredients were easily compiled on Friday night and left overnight to sit in the fridge.  On Saturday morning, we simply preheated the oven, popped the dish in, and an hour later we had a delicious morning meal.  With only two of us, the delicious leftovers served us for breakfast for several days after. Yay for easy-to-prep meals with leftovers!

Spinach and Roasted Bell Pepper Strata
Adapted from smittenkitchen
Serves 6-8

10 ounces fresh spinach (or frozen spinach that's been drained and chopped)
1 1/2 cups finely chopped onion (1 large)
1 tablespoon unsalted butter
1 teaspoon salt
1/2 teaspoon black pepper
1/4 teaspoon grated nutmeg
8 cups cubed French or Italian bread in 1-inch cubes (1/2 lb)
8 ounces coarsely grated mozzarella (3 cups)
6 ounces roasted red bell peppers, diced (from a can or jar)
2 3/4 cups milk
9 large eggs
2 tablespoons Dijon mustard

1. Saute onions in butter in a skillet over medium heat until soft, about 5 minutes.  Add 1/2 teaspoon salt, 1/4 teaspoon black pepper and nutmeg and continue cooking for 1 minutes.  Add spinach and stir until spinach is fully cooked down.
2. Lightly grease a 9x13 glass baking dish with butter.   Spread half the bread cubes into the bottom of the dish.  Top with half the spinach mixture and half the shredded cheese.  Repeat with the second half of the bread cubes, spinach and cheese.  On the top layer, evenly spread the diced roasted red bell peppers.
3. In a large bowl, whisk together the milk, eggs, mustard, and remaining 1/2 teaspoon salt and 1/4 teaspoon black pepper.  Pour mixture evenly over the strata.  Cover the baking dish with plastic wrap and chill in the fridge for at least 8 hours or up to one day.
4. When you are ready to bake the strata, remove it from the fridge and let stand in room temperature for 30 minutes while preheating the oven to 350F.  Bake uncovered for 45-55 minutes, until strata is puffed up and golden brown.  Remove from oven and let stand for 5 minutes before serving.  Any leftovers can be stored in the fridge and reheated in the microwave.