Crustless Spinach, Mushroom & Cheese Quiches

Prep Time: 15 minutes
Cook Time: 35–45 minutes
Servings: 4–6

Ingredients

• 🥚 6 large eggs
• 🥛 1 cup milk
• 🍄 1½ cups mushrooms, sliced
• 🌿 2 cups fresh spinach, chopped
• 🫑 ½ red bell pepper, diced
• 🧅 ½ small red onion, diced
• 🧀 1 cup shredded cheese
• 🧂 ½ tsp salt
• 🌶️ ½ tsp black pepper
• 🫒 1 tbsp olive oil

Step-by-Step Instructions

1. Preheat the Oven

Preheat your oven to 375°F (190°C).

Lightly grease a round baking dish with the olive oil.

Greasing the dish helps prevent the egg mixture and melted cheese from sticking, making the finished quiche easier to slice and serve.

2. Sauté the Vegetables

Heat the olive oil in a skillet over medium heat.

Add the diced red onion and sliced mushrooms. Cook for 4–5 minutes, stirring occasionally, until the vegetables have softened and the excess moisture from the mushrooms has evaporated.

Next, add the diced red bell pepper and cook for another 2 minutes.

Stir in the chopped fresh spinach and cook until it is just wilted.

Remove the skillet from the heat and allow the vegetables to cool slightly.

Sautéing the vegetables first is important because mushrooms and spinach naturally release moisture as they cook. Removing some of that moisture helps the finished crustless quiche stay firm rather than becoming watery.

3. Prepare the Egg Mixture

Crack the 6 large eggs into a large mixing bowl.

Add the 1 cup milk, ½ teaspoon salt, and ½ teaspoon black pepper.

Whisk everything together until the mixture is smooth and well combined.

Make sure the egg whites and yolks are fully incorporated so the seasoning is evenly distributed throughout the quiche.

4. Combine the Vegetables, Cheese, and Eggs

Spread the sautéed vegetables evenly across the bottom of the greased round baking dish.

Sprinkle the 1 cup shredded cheese evenly over the vegetables.

Slowly pour the prepared egg mixture over everything, making sure it is distributed throughout the dish.

Gently shake the baking dish so the egg mixture settles between the vegetables.

Try not to stir the layers together after adding the egg mixture. Keeping the vegetables evenly distributed helps every slice contain a good combination of mushrooms, spinach, peppers, onion, cheese, and egg.

5. Bake

Place the baking dish in the preheated 375°F (190°C) oven.

Bake for 35–45 minutes, until the center is set and the top is lightly golden.

To check for doneness, carefully insert a knife into the center of the quiche. It should come out mostly clean.

The quiche should look set in the center rather than liquid or overly loose. The top should have a light golden finish, while the cheese should be melted into the egg and vegetable mixture.

6. Rest Before Serving

Remove the quiche from the oven and allow it to rest for 5–10 minutes.

This short resting period gives the quiche time to settle, making it easier to cut into neat wedges.

7. Slice and Serve

After resting, slice the quiche into wedges.

Serve warm for the best texture and flavor. Each slice should have a creamy egg base with savory mushrooms, wilted spinach, colorful peppers, onion, and melted cheese throughout.

Helpful Tips

Cook the vegetables first: Mushrooms and spinach release moisture while cooking, so sautéing them beforehand helps prevent a watery quiche.

Don’t overcook the spinach: Cook it only until just wilted. It will continue cooking slightly when the quiche goes into the oven.

Let the vegetables cool slightly: This makes it easier to combine them with the egg mixture without excessive heat affecting the eggs.

Whisk the eggs well: A smooth egg mixture helps create an even texture throughout the quiche.

Check the center: The middle should be set and slightly puffed rather than liquid or excessively jiggly.

Allow it to rest: Resting for 5–10 minutes makes the quiche easier to slice and serve.

Why You’ll Love This Recipe

• No crust required: You get all the comforting flavors of quiche without preparing a pastry crust.
• Packed with vegetables: Spinach, mushrooms, bell pepper, and red onion provide plenty of color and flavor.
• Creamy and cheesy: Milk and shredded cheese create a rich, satisfying egg mixture.
• Easy to prepare: The ingredients are simple and the preparation is straightforward.
• Versatile: It works beautifully for breakfast, brunch, lunch, or a light dinner.
• Great for sharing: The recipe makes 4–6 servings.

Serving Suggestions

Serve warm slices of quiche on their own for a simple breakfast or brunch.

For a more complete meal, pair the quiche with a fresh green salad, sliced tomatoes, or other fresh vegetables.

It also works well alongside fresh fruit for breakfast or brunch. Since the quiche already contains mushrooms, spinach, peppers, onion, eggs, and cheese, simple sides are enough to complete the meal without overwhelming it.

For serving, cut the quiche into neat wedges and arrange them on a platter. The colorful vegetables visible throughout each slice make it especially attractive for a brunch table.

Frequently Asked Questions

Why do I need to sauté the mushrooms and spinach first?

Mushrooms and spinach contain a lot of moisture. Sautéing them first helps remove excess moisture, which helps the finished quiche stay firm instead of watery.

Can I use frozen spinach?

Yes. Thaw the frozen spinach completely and squeeze out as much water as possible before adding it to the recipe.

How do I know when the quiche is fully cooked?

The center should look set and slightly puffed, rather than liquid or very jiggly. You can also insert a knife into the center; it should come out mostly clean.

Why is this quiche crustless?

The recipe does not use a pastry crust. The eggs, milk, vegetables, and cheese bake together directly in the greased baking dish.

Can I prepare the vegetables ahead of time?

Yes. The vegetable mixture can be sautéed ahead and allowed to cool slightly before being added to the baking dish.

Why should I let the quiche rest after baking?

Resting for 5–10 minutes allows the eggs to settle and makes the quiche easier to slice cleanly.

What is the best way to serve it?

Serve the quiche warm, sliced into wedges. It can be enjoyed on its own or paired with a fresh salad or vegetables.

Ingredient Highlights

Eggs: Form the main structure of the crustless quiche and create its soft, savory texture.

Milk: Adds creaminess and helps create a tender egg mixture.

Mushrooms: Provide an earthy, savory flavor and satisfying texture.

Spinach: Adds fresh vegetable flavor and vibrant green color.

Red bell pepper: Brings sweetness, color, and a mild vegetable flavor.

Red onion: Adds a subtle savory sweetness after sautéing.

Shredded cheese: Melts throughout the quiche and creates its rich, cheesy finish.

Olive oil: Helps sauté the vegetables and grease the baking dish.