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Spinach and Mushroom Egg Casserole: A Brunch Classic

My grandmother, Nana Elsie, had a knack for making even the simplest meals feel like a celebration. I remember, as a child, waking up to the comforting aroma of her baking on Easter mornings. This Spinach and Mushroom Egg Casserole, while not Nana Elsie’s exact recipe, evokes that same sense of warmth and family. The earthy mushrooms, vibrant spinach, and cheesy goodness baking in the oven…it’s a flavor memory that takes me right back to her bustling kitchen, surrounded by loved ones and laughter.

Recipe Overview

Prep Time: 20 minutes
Cook Time: 40 minutes
Total Time: 1 hour
Servings: 6
Yield: 1 casserole
Dietary Type: Vegetarian

Ingredients

1 cup milk
¾ cup small curd cottage cheese
6 eggs
1 (10 ounce) package frozen chopped spinach
2 cups fresh mushrooms, sliced
½ cup onion, finely chopped
½ cup celery, finely chopped
½ cup flour
2 cups Colby-Monterey Jack cheese, finely shredded
4 tablespoons margarine
1 teaspoon coarsely ground pepper
1 teaspoon salt (or salt substitute)
¼ teaspoon paprika

Equipment Needed

13 x 9 inch baking pan
Cooking spray
Small saucepan
Medium-size bowl
Whisk or blender
Knife
Cutting board
Measuring cups and spoons

Instructions

Preheat your oven to 350°F (175°C). Prepare a 13 x 9 inch baking pan by lightly coating it with cooking spray. This will prevent the casserole from sticking and make cleanup a breeze.
Cook the frozen chopped spinach according to the package directions. Be sure to add salt to the water as it cooks to help season the spinach.
Once the spinach is cooked, thoroughly drain it. Press out any excess water; otherwise, the casserole could become soggy. Set the drained spinach aside.
In a small saucepan, melt the margarine over medium heat. Add the finely chopped onion and celery. Saute them until they are softened, translucent, and fragrant, but not browned. This usually takes about 5-7 minutes. Stir frequently to prevent burning.
Combine the cooked spinach with the sauteed onions and celery in a bowl. Mix well, ensuring the flavors are evenly distributed. Set this mixture aside.
In a medium-size bowl, crack the eggs and beat them well with a whisk or blender. Gradually add the milk to the eggs as you continue to beat or blend.
Slowly add the flour to the egg and milk mixture. Continue to beat or blend until the mixture is smooth and free of any lumps. A smooth batter ensures an even texture in the baked casserole.
Add the pepper and salt (or salt substitute) to the egg mixture and stir well to combine. This is your custard base, so taste and adjust seasonings as needed.
Using a spoon or spatula, spread the cottage cheese evenly on the bottom of the prepared baking pan. The cottage cheese layer adds a creamy and slightly tangy base to the casserole.
Spread the spinach mixture evenly over the layer of cottage cheese.
Place a layer of sliced fresh mushrooms over the spinach layer. Ensure the mushrooms are evenly distributed for consistent flavor in every bite.
Pour the egg mixture evenly over the mushroom layer, making sure it covers all the vegetables. Gently tap the pan on the counter to release any trapped air bubbles.
Top the egg mixture with the finely shredded Colby-Monterey Jack cheese. Make sure the cheese is evenly spread to create a golden-brown, cheesy crust. Sprinkle with paprika for color.
At this point, you can either bake the casserole immediately or cover it tightly with plastic wrap and store it in the refrigerator overnight. This make-ahead option is perfect for busy mornings or when you’re preparing for a brunch gathering.
Bake in the preheated oven at 350°F (175°C) for 40 minutes, or until the casserole is firm in the center and the cheese is melted and lightly golden brown. To test for doneness, insert a knife into the center of the casserole; if it comes out clean, it’s ready. If it’s still wobbly, continue baking for a few more minutes.

Expert Tips & Tricks

Preventing a Soggy Casserole: As mentioned earlier, ensuring the spinach is thoroughly drained is crucial to avoid a soggy casserole. You can even use a clean kitchen towel to gently squeeze out any remaining moisture.
Enhancing the Mushroom Flavor: For a deeper, more intense mushroom flavor, consider sauteing the sliced mushrooms in a separate pan with a little butter or olive oil before adding them to the casserole.
Make-Ahead Magic: As this casserole can be assembled ahead of time, consider baking it the night before for a truly relaxed morning. Simply cover and refrigerate the unbaked casserole, then add about 10-15 minutes to the baking time to ensure it’s heated through.
Cheese Perfection: Using freshly shredded cheese will melt more evenly and provide a superior flavor compared to pre-shredded varieties.
Spice it Up: For a bit of heat, add a pinch of red pepper flakes to the spinach mixture or use a spicy Monterey Jack cheese blend.

Serving & Storage Suggestions

Serve the Spinach and Mushroom Egg Casserole warm, straight from the oven. It’s delicious on its own or accompanied by a side of fresh fruit, a crisp green salad, or some toasted whole-wheat bread.

Leftovers can be stored in an airtight container in the refrigerator for up to 3-4 days. To reheat, simply microwave individual portions or bake the entire casserole in a preheated oven at 350°F (175°C) until heated through.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	380 kcal	19%
Total Fat	25g	38%
Saturated Fat	12g	60%
Cholesterol	240mg	80%
Sodium	900mg	38%
Total Carbohydrate	15g	5%
Dietary Fiber	2g	8%
Sugars	3g	–
Protein	23g	46%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

Gluten-Free: Substitute the all-purpose flour with a gluten-free flour blend.
Dairy-Free: Use a plant-based milk alternative, such as almond or soy milk, and substitute the cottage cheese and Colby-Monterey Jack cheese with dairy-free alternatives.
Vegetable Medley: Add other favorite vegetables, such as diced bell peppers, zucchini, or asparagus, to the spinach mixture.
Meat Lover’s Addition: Cooked and crumbled sausage, bacon, or ham can be added to the spinach mixture for a heartier casserole.

FAQs (Frequently Asked Questions)

Q: Can I use fresh spinach instead of frozen?
A: Yes, you can! You’ll need about 1 pound of fresh spinach. Sauté it until wilted before adding it to the casserole. Make sure to drain the excess water.

Q: Can I make this casserole without cottage cheese?
A: Absolutely. You can substitute it with ricotta cheese or cream cheese for a similar texture. Or, simply omit it altogether and add more shredded cheese.

Q: How do I prevent the cheese from browning too quickly?
A: If the cheese starts to brown too much before the casserole is fully cooked, tent the baking dish with aluminum foil.

Q: Can I add other types of cheese?
A: Certainly! Feel free to experiment with different cheese blends, such as cheddar, Gruyere, or mozzarella.

Q: Is this casserole suitable for freezing?
A: While you can freeze it, the texture may change slightly. It’s best enjoyed fresh. If freezing, wrap it tightly in plastic wrap and then aluminum foil. Thaw overnight in the refrigerator before reheating.

Final Thoughts

This Spinach and Mushroom Egg Casserole is more than just a recipe; it’s a way to bring people together. Whether you’re serving it for a special occasion or a simple weekend brunch, it’s sure to be a crowd-pleaser. Don’t be afraid to experiment with variations and make it your own. And most importantly, enjoy the process of creating and sharing this delicious dish! Happy cooking!

Spinach and Mushroom Egg Casserole Recipe