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There is something incredibly comforting and satisfying about a savory brunch that feels both elegant and effortless, which is exactly what makes the Feta & Mushroom Brunch Squares Recipe a total winner. These squares bring together the earthiness of mushrooms, the creamy tang of feta, and a light, fluffy egg base that bakes to golden perfection. Whether you’re hosting a casual weekend brunch or want a make-ahead breakfast that wows, this recipe hits all the right notes with its balanced flavors and beautiful texture. Each square is a little savory bite of happiness that you’ll want to share with friends and family again and again.

Ingredients You’ll Need
Gathering the right ingredients for your Feta & Mushroom Brunch Squares Recipe is simpler than you might think, but each element plays such a crucial role in creating those rich, comforting layers of flavor and texture. Freshness and balance are key, from the juicy mushrooms to the salty kick of feta cheese.
- Olive oil: Acts as the perfect base for sautéing onions and mushrooms, infusing a subtle fruity richness.
- Small onion, finely chopped: Adds natural sweetness and depth when softened in the pan.
- Mushrooms, sliced: Provide that earthy, meaty texture which is the heart of this brunch treat.
- Garlic, minced: Brings a fragrant note that elevates the savory profile of the squares.
- Large eggs: The binding agent that creates the fluffy and tender structure of the squares.
- Milk: Keeps the texture moist and soft, without weighing anything down.
- Salt: Enhances all the subtle flavors and balances the tang of the cheese.
- Black pepper: Adds a gentle kick to keep the flavor lively.
- Dried oregano: Infuses a hint of herbal earthiness to complement the mushrooms.
- Crumbled feta cheese: The star ingredient offering creamy, salty bursts in every bite.
- Grated Parmesan (optional): Adds an extra layer of cheesy richness and a golden crust.
- Chopped fresh parsley or spinach (optional): Brings brightness and a touch of vibrant green to the dish.
- Cooking spray or butter: Essential for greasing the baking dish to prevent sticking and ease serving.
How to Make Feta & Mushroom Brunch Squares Recipe
Step 1: Prepare Your Baking Dish and Oven
Start by heating your oven to 350°F (175°C) and lightly greasing an 8×8-inch baking dish. This simple prep ensures your brunch squares will bake evenly and slide out easily once cooked.
Step 2: Sauté the Aromatics
Heat the olive oil in a skillet over medium heat. Add the finely chopped onion and cook until translucent, about 3 minutes. This soft onion base creates a sweet and fragrant foundation for the mushrooms.
Step 3: Cook the Mushrooms and Garlic
Add the sliced mushrooms to the skillet and cook until they release their juices and soften, about 5 to 7 minutes. Once the moisture evaporates, stir in the minced garlic and let it cook for another minute to awaken the flavors without burning.
Step 4: Mix the Egg Base
In a bowl, whisk together the eggs, milk, salt, black pepper, and dried oregano until smooth and well combined. This mixture will give the squares a tender, custardy texture and a subtle herbal note.
Step 5: Combine All Ingredients
Gently fold the sautéed mushroom and onion mixture into the egg base. Stir in the crumbled feta cheese, Parmesan if using, and the chopped fresh parsley or spinach. This blend promises bursts of flavor and a beautiful balance of colors in every bite.
Step 6: Bake to Perfection
Pour the mixture into your prepared baking dish, smoothing the top for even baking. Pop it into the oven for 30 to 35 minutes until the center is set and the top turns lightly golden brown. The smell alone will have you eager to taste!
Step 7: Cool and Slice
Once baked, let the dish cool for 5 to 10 minutes. This resting time helps the squares firm up a bit so you can cut them neatly into 9 or 9 squares depending on your preference, ready to serve warm or at room temperature.
How to Serve Feta & Mushroom Brunch Squares Recipe

Garnishes
A sprinkle of freshly chopped parsley or a few delicate basil leaves on top can add a pop of color and fresh aroma, making each slice even more inviting. Consider also a light drizzle of extra virgin olive oil or a dusting of cracked black pepper to enhance the visual appeal and flavor.
Side Dishes
These brunch squares pair beautifully with simple, fresh sides like a crisp mixed green salad or ripe tomato slices. For something heartier, roasted potatoes or a warm whole-grain bread complement the dish’s richness perfectly, creating a balanced and complete meal.
Creative Ways to Present
Try serving the squares on a wooden cutting board for a rustic look or arrange them on a colorful platter with small bowls of olives, hummus, or fruit preserves to create a vibrant brunch spread. You can also use mini muffin tins to bake individual portions, ideal for parties or grab-and-go breakfasts.
Make Ahead and Storage
Storing Leftovers
Once cooled, store any leftover Feta & Mushroom Brunch Squares in an airtight container in the refrigerator for up to 3 days. They maintain their flavor and texture well, making them perfect for quick snacks or lunches.
Freezing
This recipe freezes beautifully. Wrap individual squares tightly in plastic wrap and place them in a sealed freezer bag or container. Freeze for up to 1 month, allowing you to enjoy this delicious brunch anytime you want with minimal prep.
Reheating
For best results, thaw frozen squares overnight in the fridge and reheat in a preheated oven at 325°F (160°C) for 10 to 15 minutes until warmed through. Alternatively, you can microwave single portions for a minute or two, but the oven helps keep that delightful baked texture intact.
FAQs
Can I use other types of cheese instead of feta?
Absolutely! While feta adds a distinctive tang and creaminess, you can experiment with goat cheese, ricotta, or even shredded mozzarella for a milder taste. Just keep in mind that the flavor profile will shift slightly.
Are these squares suitable for meal prep?
Definitely yes. The Feta & Mushroom Brunch Squares Recipe is perfect for meal prep since it stores well and reheats nicely. Prepare a batch ahead of time to simplify your mornings or have ready-made snacks on hand.
Can I add more vegetables to this recipe?
Feel free to toss in chopped bell peppers, zucchini, or sun-dried tomatoes for added flavor and color. Just be mindful to sauté watery vegetables properly to avoid excess moisture, which can affect the baking.
Is this recipe gluten-free?
Yes! This recipe contains no flour or gluten-containing ingredients, making it naturally gluten-free and a great option for those with gluten sensitivities or allergies.
What can I serve with these brunch squares for a festive occasion?
Pair these squares with fresh fruit platters, mimosas or a fresh squeezed juice, and a variety of artisan breads or pastries. Adding some smoked salmon or prosciutto on the side elevates the brunch to special occasion status.
Final Thoughts
Trust me when I say the Feta & Mushroom Brunch Squares Recipe is going to become one of your go-to dishes for brunch, snacks, and light meals. Its combination of simple, wholesome ingredients comes together in a way that feels cozy and indulgent all at once. I encourage you to give this recipe a try—it’s comforting, approachable, and absolutely delicious to share with the people you love.
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Feta & Mushroom Brunch Squares Recipe
- Prep Time: 10 minutes
- Cook Time: 35 minutes
- Total Time: 45 minutes
- Yield: 9 squares
- Category: Brunch
- Method: Baking
- Cuisine: Mediterranean
- Diet: Vegetarian
Description
These Feta & Mushroom Brunch Squares are a savory and satisfying baked egg dish perfect for a weekend brunch or light breakfast. Packed with sautéed mushrooms, tangy feta cheese, and flavorful herbs, they offer a delightful combination of flavors and textures in each square.
Ingredients
Main Ingredients
- 1 tbsp olive oil
- 1 small onion, finely chopped
- 2 cups mushrooms, sliced
- 2 cloves garlic, minced
- 6 large eggs
- 1/2 cup milk
- 1/2 tsp salt
- 1/4 tsp black pepper
- 1/4 tsp dried oregano
- 1 cup crumbled feta cheese
- 1/4 cup grated Parmesan cheese (optional)
- 1/4 cup chopped fresh parsley or spinach (optional)
- Cooking spray or butter for greasing the dish
Instructions
- Preheat and prepare: Preheat your oven to 350°F (175°C) and lightly grease an 8×8-inch baking dish using cooking spray or butter to prevent sticking.
- Sauté onion: In a skillet over medium heat, heat the olive oil and sauté the finely chopped onion until it becomes translucent, about 3 minutes.
- Cook mushrooms and garlic: Add the sliced mushrooms to the skillet and cook until they soften and their moisture evaporates, about 5 to 7 minutes. Stir in the minced garlic and cook for an additional minute. Remove from heat and let the mixture cool slightly.
- Mix eggs and seasonings: In a large mixing bowl, whisk together the eggs, milk, salt, black pepper, and dried oregano until everything is well combined.
- Add sautéed vegetables and cheese: Stir the cooled mushroom and onion mixture into the egg mixture along with the crumbled feta cheese, Parmesan (if using), and chopped parsley or spinach for added flavor and color.
- Transfer to baking dish: Pour the combined mixture into the prepared baking dish, smoothing the top evenly.
- Bake: Bake in the preheated oven for 30 to 35 minutes or until the center is set and the top turns lightly golden brown.
- Cool and serve: Allow the baked squares to cool for 5 to 10 minutes before slicing into 9 squares. Serve warm or at room temperature as a delicious brunch option.
Notes
- You can substitute fresh spinach for parsley to add a different flavor profile.
- Using whole milk results in a richer, creamier texture but you can use lower-fat milk if preferred.
- The Parmesan cheese is optional but adds a nice sharpness to complement the feta.
- Make sure to cook mushrooms thoroughly to release moisture, preventing a soggy texture in the final dish.
- Store leftovers in the refrigerator and reheat gently before serving.

