Spinach Mushroom Strata

Course: Breakfast
Cuisine: American
Keyword: eggs, mushrooms, spinach, sun dried tomatoes
Prep Time: 30 minutes
Cook Time: 50 minutes
Servings: 6
Calories: 251kcal
One of the simplest ways to entertain overnight guests is with a delicious strata for breakfast.  It assembles in no time and is ready to bake while you're having your coffee the next morning!
Print Recipe


  • 12 ounces crimini or button mushrooms thinly sliced
  • 1 teaspoon butter
  • 8 ounces fresh spinach or 1 box frozen chopped spinach thawed
  • 1/3 cup sun-dried tomatoes chopped
  • 1/2 cup gruyere cheese + extra for sprinkling
  • 1/4 cup parmesan cheese + extra for sprinkling
  • 5 large eggs
  • 1 1/2 cups milk
  • 1 teaspoon mustard powder
  • 1/8 teaspoon cayenne pepper
  • 3/4 teaspoon garlic salt
  • 1/2 teaspoon black pepper
  • 3/4 teaspoon kosher salt divided
  • 4 cups stale italian or sourdough bread crusts removed, cut into 1/2" cubes


  • In a non stick skillet with a lid, heat over medium high heat until pan is hot. Add sliced mushrooms and 1/4 teaspoon kosher salt to the skillet and stir once or twice. Put the lid on the pan and let the mushrooms give off their liquid for a minute. Continue to check the mushrooms and stir every 30 seconds or so until all of their liquid has been given up and mushrooms are slightly browned. Transfer the mushrooms to a medium bowl.

If you're using fresh spinach

  • Add the butter to the pan and saute the fresh spinach until it just wilts. Transfer the spinach to a fine mesh sieve and press on the spinach with the back of a spoon to squeeze out all the excess liquid. Chop the spinach on a cutting board then add it to the mushrooms

If you're using frozen spinach

  • Place spinach in a clean dish towel and squeeze out all the liquid and add it to the mushrooms.
  • Toss the sun-dried tomatoes with the spinach and mushrooms, set aside.
  • In a medium bowl whisk together the eggs, milk, mustard powder, cayenne pepper, garlic salt, black pepper and remaining 1/2 teaspoon kosher salt. Stir in the cheeses.
  • Spray a 4-5 cup casserole dish with nonstick spray. Add 1/3 of the bread cubes. Sprinkle with half of the vegetable mixture. Pour 1/3 of the egg and cheese mixture over the vegetables. Top with 1/3 of the bread cubes and the remaining half of the vegetables. Top with the remaining bread and pour the rest of the egg/cheese mixture evenly over the bread.
  • Use your hands to press the bread lightly into the mixture to soak up the egg custard.
  • Top with a sprinkling of gruyere and parmesan cheese. Cover and refrigerate for 8 hours or overnight.
  • Take the strata out of the refrigerator half an hour before you're ready to bake. Preheat the oven to 350 degrees. Bake strata for 45-50 minutes until puffed, browned and bubbly. Let it rest for 10 minutes before serving.


This recipe can be doubled.


Calories: 251kcal | Carbohydrates: 20g | Protein: 17g | Fat: 11g | Saturated Fat: 5g | Cholesterol: 159mg | Sodium: 911mg | Potassium: 684mg | Fiber: 2g | Sugar: 7g | Vitamin A: 4960IU | Vitamin C: 5.7mg | Calcium: 315mg | Iron: 2.9mg