This delicious Spinach and Mushroom Strata is a layered casserole that's packed with savory ingredients and can be made in advance. It's the perfect dish for Sunday brunch!
My Spinach and Mushroom Strata is a perfect dish for Sunday brunch. It's rich, delicious, and can feed a crowd. And the best part is that you can make it the day before and store it in the refrigerator. Then when you're ready to serve it, simply pop it in the oven and you'll have a bunch of happy guests!
I'm all about make-ahead breakfasts as I'm usually in a rush to get out the door in the mornings. Some of my favorite make-ahead breakfasts are my Healthy Breakfast Burritos, Berry Chia Pudding, and Wild Blueberry Breakfast Cookies.
What Is A Strata?
A strata is a layered casserole made with cubed bread, eggs, cheese and other ingredients like vegetables or meat. It’s like a casserole or savory bread pudding and is definitely a comfort food.
The beauty of making a strata is that you can toss in whatever ingredients you have on hand in your fridge or pantry. Pretty much any veggies work well in a strata like onions, bell peppers, zucchini, and butternut squash. You can also use meat like diced chicken, turkey or sausage. My favorite combination is spinach and mushrooms.
A strata is also the perfect make-ahead dish! You can prepare this spinach and mushroom egg casserole the night before. Then in the morning, simply pop it in the oven and you're good to go!
Why This Strata is Healthier
A traditional strata is a very rich dish with large amounts of butter, cream, and cheese. However to make my spinach and mushroom strata healthier, I use olive oil, reduced fat milk, and a lot less cheese. Gruyere is a strong cheese so a little goes a long way.
For this healthy strata, I also like to use whole grain bread to incorporate healthy whole grains into the dish. Whole grains have high amounts of fiber, vitamins, minerals and antioxidants, which help reduce your risk of chronic disease. Read my post Everything You Need To Know About Whole Grains.
Day-old or stale bread works best to soak up all the custard. I often use a loaf of bread from my local bakery and leave it out overnight.
How To Make Spinach and Mushroom Strata
These are the basic steps for making any strata:
- Step 1- Cut the bread into cubes and place them in a large bowl.
- Step 2- Sauté your veggies in a skillet with some olive oil. Add any seasonings. Add the mixture to the bowl with the cubed bread and toss to mix everything together.
- Step 3- Make the egg custard by whisking eggs, milk, seasonings, and grated cheese.
- Step 4- Transfer the bread mixture to a greased baking dish and pour the egg custard on top. Press down on the bread to submerge it all in the liquid.
- Step 5- Bake in the oven at 350°F for 50-60 minutes until puffed up and golden brown.
How To Serve This Dish
You can serve this spinach and mushroom strata in a large casserole dish. It's an elegant looking dish that's perfect when you have guests over.
You can serve it alongside other brunch dishes like my strawberry oatmeal blender pancakes, peach baked oatmeal, or spiced apple muffins.
You can also bake this spinach and mushroom strata in individual portions in a muffin pan. That way, you can have a convenient and healthy grab-and-go breakfast any day of the week!
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Spinach and Mushroom Strata
- 10 ounces day-old or stale whole grain bread cut into ¾-inch pieces (about 8 cups)
- 2 tablespoons olive oil
- ¼ cup chopped shallots
- 10 ounces cremini mushrooms, sliced
- 1 box (10 ounces) frozen chopped spinach, defrosted and squeezed dry
- ¾ teaspoon dried thyme (or 1 tablespoon fresh)
- 1 teaspoon salt, divided
- ½ teaspoon pepper, divided
- 8 large eggs
- 2 cups 2% or whole milk
- 1 tablespoon Dijon mustard
- 3 ounces grated Gruyere cheese, divided
- Place the bread in a large bowl. Heat the oil in a large skillet over medium heat. Add the shallots and cook 1-2 minutes until tender. Add the mushrooms and cook, 3-4 minutes until they start to soften. Add the spinach and stir to combine. Season the mixture with the thyme, ½ teaspoon salt and ¼ teaspoon pepper. Transfer the mixture to the bowl with the bread and mix the ingredients together.
- Whisk the eggs, milk, mustard, ½ teaspoon salt, ¼ teaspoon pepper and about ¾ of the cheese together in another bowl.
- Spray a 8x12-inch baking dish with cooking spray. Transfer the bread and vegetable mixture to the dish, spreading it out evenly. Pour the egg mixture over the top and gently press the bread down into the liquid. Sprinkle the remaining cheese on top. Alternatively, to make individual portions, divide the mixture between the cups of a muffin pan (it will make about 16 portions so you may need two pans).
- Let the mixture sit while you preheat the oven to 350 degrees F. Alternatively, the dish can be prepared the night before and allowed to soak in the refrigerator overnight.
- Bake strata in the oven uncovered for 50-60 minutes (30-40 minutes if using a muffin pan) until it is puffed up and golden brown. Cut into pieces and serve.
T. Ring says
I am going to make this. Am I able to make this a day ahead and freeze it? I want to take it on a road trip. Thanks!
Hi! Yes, you can freeze it. I would assemble the dish, cover it with plastic wrap and foil, and freeze it without baking it. When you’re ready to cook it, first thaw it overnight in the refrigerator. Then let it come to room temperature and bake as directed in the recipe. I hope you love it!
T. Ring says
Thank you so much! I didn't think about using plastic and foil. I am going to assemble in a large Pyrex baking dish that also came with a lid and a travel case. I was going to pull it out of the freezer and put into an ice chest the day we drive 2 hours to our destination. I will report back. 😉
Could I use a bag of fresh spinach?
Lisa Lin says
Sonali, you are definitely reading my mind! I was just thinking about making some time of egg casserole dish the other day. Love the gruyere in this!
Gramma Audrey says
Made it with egg whites. YUMM!!
Thanks! So glad you enjoyed it 🙂
Thanks. I've been teaching myself to cook and yours has become my favorite website resource. Love the recipes and education you provide.
Thanks so much! This really means a lot to me!
Yes, egg beaters would work. Or leave out half of the egg yolks (4) and add 4 more egg whites.
Can I swap out the eggs for something else? Trying to watch my cholesterol.
Lyuba @ Will Cook For Smiles says
Gorgeous all around!! This strata sounds fantastic! Love the flavor combo here 🙂
Thanks so much! I'm so glad we connected, I love your blog!
Sounds like a great brunch recipe with all the important nutritional ingredients.
Definitely going to try it.
Thanks for stopping by- I hope you like it!