Mushroom Zucchini Egg Bake
Equipment
- Casserole dish
- medium mixing bowl
- skillet
- Steamer basket
- Whisk
Ingredients
- 12 ounces Zucchini peeled and cubed
- 1 small Onion chopped
- 1½ tablespoons Unsalted Butter
- 6 ounces Mushrooms sliced
- 3 large Eggs lightly beaten
- 1⅓ cups Cheddar Cheese grated
- ¾ teaspoon Dried Basil
- ½ teaspoon Kosher Salt
- ¼ teaspoon Black Pepper freshly ground
- 1 teaspoon Unsalted Butter for greasing
Instructions
- Preheat the oven to 325°F (160°C).
- Melt the butter in a skillet.
- Sauté the mushrooms and onion until the onion is soft and the mushrooms are tender.
- While the vegetables are sautéing, steam the zucchini until tender and mash it coarsely.
- In a medium-sized bowl, combine the mashed zucchini and eggs.
- Add the sautéed mushrooms and onions to the zucchini-egg mixture and stir to combine.
- Season with dried basil, salt, and pepper.
- Pour the mixture into a greased casserole dish and bake, covered, for about 30 minutes, or until the eggs have set.
- Uncover the dish and sprinkle the grated cheddar cheese on top.
- Continue baking until the cheese is melted and bubbly.
Notes & Wine Advice
Serving Suggestions
Serve the casserole warm with toasted bread, roasted potatoes, a green salad, or sliced tomatoes. It is suitable for breakfast, brunch, or a light dinner. For a larger brunch, pair it with our Italian Zucchini Herb Frittata.Recipe Notes
Drain the steamed zucchini thoroughly before mashing it because excess moisture can prevent the eggs from setting properly. Cook the mushrooms until their released liquid has evaporated. The casserole is ready when the centre feels firm and no liquid egg remains.Variations
Replace cheddar with Monterey Jack, mozzarella, Parmesan, or goat cheese. Add spinach, roasted peppers, chopped chives, thyme, or red pepper flakes. Broccoli, leek, or cooked potato can replace part of the zucchini.Storage
Refrigerate leftovers in an airtight container for up to three days. Reheat individual portions in the oven, air fryer, or microwave until hot throughout. The casserole can also be served chilled or at room temperature.Wine Advice
A light Pinot Noir complements the earthy mushrooms and melted cheddar. A lightly oaked Chardonnay is a suitable white alternative for the rich egg and cheese filling.Nutrition values
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About Mushroom Zucchini Egg Bake
Mushroom Zucchini Egg Bake is a comforting vegetarian casserole made with tender zucchini, sautéed mushrooms, onion, eggs, basil, and melted cheddar. This zucchini mushroom casserole has a soft vegetable and egg centre covered with a bubbling layer of cheese. It can be served for breakfast, brunch, lunch, or a relaxed family dinner.
The recipe cooks the vegetables before they are combined with the eggs. This is an essential step because both mushrooms and zucchini contain substantial amounts of moisture. Removing some of that liquid before baking helps the casserole set properly and prevents a watery result.
Preparing Mushroom Zucchini Egg Bake
Peel and cube the zucchini into evenly sized pieces before placing it in the steamer basket. Steam it only until tender enough to mash. Once cooked, leave it to drain thoroughly before crushing it coarsely with a potato masher or fork.
A coarse texture works better than a completely smooth purée. Small pieces of zucchini give the finished casserole more structure and make the vegetable flavour noticeable. If the mashed zucchini still appears watery, press it gently in a strainer before adding the eggs.
Melt the butter in a skillet and cook the mushrooms with the chopped onion. Mushrooms initially absorb fat and then release their own moisture. Continue cooking until they are tender and most of the liquid in the skillet has evaporated. This concentrates their earthy flavour and protects the texture of the casserole.
Assembling the Zucchini Mushroom Casserole
Combine the drained zucchini with the lightly beaten eggs in a mixing bowl. Add the sautéed mushroom mixture and season everything with dried basil, salt, and black pepper. Stir until the mushrooms and onion are distributed evenly rather than concentrated in one area.
Transfer the mixture to a greased casserole dish and spread it into an even layer. Covering the dish during the first stage of baking allows the eggs to set gently without drying the surface. Check the centre after approximately 30 minutes. It should be firm and contain no visible liquid egg.
Remove the cover and add the grated cheddar only after the filling has set. Return the dish to the oven briefly so the cheese melts and begins to bubble. Adding it near the end prevents the cheddar from becoming tough or excessively browned.
Cheese and Vegetable Variations
Sharp cheddar provides a strong savoury contrast to the mild zucchini and eggs. Monterey Jack or mozzarella creates a softer and milder topping, while Parmesan adds a saltier finish. Goat cheese can be crumbled into the egg mixture when a tangier flavour is preferred.
Spinach, roasted peppers, leek, broccoli, or cooked potato can replace part of the zucchini. Cook and drain moist vegetables before adding them. Fresh thyme, parsley, chives, or oregano can replace the dried basil, while red pepper flakes provide gentle heat.
Serving the Finished Bake
Allow the casserole to rest for approximately 5 minutes before cutting it. This gives the egg filling time to settle and makes the portions easier to remove cleanly. Serve it with toast, roasted potatoes, sliced tomatoes, fruit, or a green salad.
For a larger brunch selection, pair it with our Italian Zucchini Herb Frittata. Smaller portions can also be served as a vegetable side dish alongside roasted meat or grilled chicken.
Storage and Safe Reheating
Cool leftovers promptly and transfer them to an airtight container. Refrigerate for up to three days. Reheat individual portions until hot throughout, taking care not to overcook them because eggs can become firm and rubbery.
Follow current FDA safe food-handling guidance when preparing eggs and storing or reheating cooked dishes.
Earthy mushrooms, tender zucchini, savoury eggs, and melted cheddar make Mushroom Zucchini Egg Bake a satisfying vegetable casserole for almost any meal.