Vegetarian Breakfast Casserole with Spinach and Mushrooms

Sep 12, 2025
by Adrienne Streich
- 4.0 / 5 ( 1 Ratings)
1 Likes

PREP TIME

15 mins
COOK TIME

40 mins
TOTAL TIME

8 hrs 55 mins
SERVING

8 People
VIEWS

3

Wake up to a symphony of savory flavors with this delightful vegetarian breakfast casserole. Featuring earthy mushrooms, vibrant spinach, and a blanket of melted cheese, it's a comforting and effortless way to start your day. Prepare it the night before and let the flavors meld together, ensuring a stress-free morning feast.

Ingridients

Adjust Servings

Nonstick cooking spray

6 slices of white bread, cut into 1/2-inch cubes

2 cups whole milk

6 large eggs

1 teaspoon sea salt

1 teaspoon freshly ground black pepper

2 cups shredded Monterey Jack cheese, divided

1 (10 ounce) package frozen chopped spinach, thawed and thoroughly drained

1 (10 ounce) can sliced mushrooms, drained

Nutrition

Carbohydrate

16 g
Cholesterol

170 mg
Fiber

2 g
Protein

17 g
Saturated Fat

8 g
Sodium

824 mg
Sugar

5 g
Fat

14 g
Unsaturated Fat

0 g

Follow The Directions

01

Step

Preheat the orchestra: Preheat your oven to 350 degrees F (175 degrees C). (5 minutes)

02

Step

Prepare the stage: Generously spray a 9x13-inch baking dish with nonstick cooking spray. Arrange the bread cubes evenly across the bottom of the dish. (5 minutes)

03

Step

Compose the custard: In a large bowl, whisk together the eggs, milk, salt, and pepper until well combined. Gently pour this mixture evenly over the bread cubes, ensuring they are all moistened. (5 minutes)

04

Step

Layer the flavors: Sprinkle 1 cup of the Monterey Jack cheese evenly over the soaked bread. Next, layer the drained spinach, followed by the drained sliced mushrooms. Finally, top with the remaining 1 cup of Monterey Jack cheese. (10 minutes)

05

Step

Rest and harmonize: Cover the baking dish tightly with plastic wrap or aluminum foil. Refrigerate for at least 8 hours, or preferably overnight, to allow the flavors to meld and the bread to absorb the custard. (8 hours)

06

Step

Bake to golden perfection: Remove the casserole from the refrigerator and uncover. Bake in the preheated oven until the casserole is set and the top is golden brown, approximately 40 to 45 minutes. A knife inserted into the center should come out clean. (45 minutes)

07

Step

Rest and serve: Let the casserole rest for 10 minutes before slicing and serving. This allows the flavors to settle and the casserole to become easier to cut. (10 minutes)

For an extra layer of flavor, sauté the mushrooms with a clove of minced garlic and a tablespoon of butter before adding them to the casserole.
Feel free to substitute other cheeses, such as cheddar, Gruyere, or mozzarella, for the Monterey Jack.
Add a pinch of nutmeg to the egg mixture for a warm, comforting note.
If you don't have frozen spinach, use fresh spinach that has been lightly sautéed and drained.
This casserole can be easily doubled or tripled for larger gatherings.

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Adrienne Streich

Written by

Our recipe authors are passionate food lovers who share thousands of diverse dishes from around the world. They bring daily cooking inspiration with delicious, easy-to-make recipes for every occasion.