This mushroom crustless quiche is a colorful breakfast built from tender vegetables, creamy eggs, and a little melted mozzarella. Because there is no pastry to roll or chill, the preparation is mostly a matter of chopping, layering, whisking, and baking. The vegetables stay visible in the finished slices, while the egg custard sets around them into a soft, savory center. Serve it warm for brunch, or cool it slightly so the clean slices are easy to portion for weekday breakfasts.
What is mushroom crustless quiche?
A crustless quiche is an egg-based bake with the pastry omitted. This version combines sliced mushrooms with spinach, cherry tomatoes, onion, mozzarella, and a seasoned mixture of eggs and heavy cream. It is similar to a frittata, but the gentle layering in a pie dish gives it a quiche-like shape and a soft, even interior.
The recipe makes eight servings and takes about 15 minutes to assemble. The vegetables are arranged directly in the prepared dish, so there is no separate sautéing step in the primary method. A baking sheet underneath the dish adds a little insurance against spills as the custard cooks.
Why this vegetable quiche works
Mushrooms bring a savory, earthy note, while tomatoes add small pockets of brightness. Spinach softens into the custard, and mozzarella melts into mild, stretchy bites without overwhelming the vegetables. Ground mustard and garlic powder give the eggs a fuller flavor with pantry-friendly seasoning.
Layering also keeps the preparation simple. The egg mixture is poured around the vegetables instead of stirred through them, helping the finished quiche retain distinct colors and textures. Bake until the center is set and a toothpick comes out clean; the residual heat will finish the center as the quiche cools.
Ingredients for mushroom crustless quiche
- 1 cup diced yellow onion
- 1 cup chopped baby spinach
- 1 cup cherry tomatoes, sliced in half
- 1/2 cup shredded mozzarella cheese
- 1/2 cup sliced mushrooms
- 8 large eggs
- 1/2 cup heavy cream
- 1/2 teaspoon ground mustard
- 1/2 teaspoon garlic powder
- 1/2 teaspoon salt
- 1/4 teaspoon ground black pepper
How to make mushroom crustless quiche
Have the vegetables prepared before you begin, and use a pie dish or quiche pan that fits comfortably on a baking sheet. The baking sheet makes transferring the filled dish easier and catches any overflow.
- Preheat the oven to 350°F. Spray a quiche pan or pie dish with nonstick cooking spray and set it on a baking sheet.
- Add the diced onion to the dish, then sprinkle the chopped spinach over it.
- Arrange the halved cherry tomatoes over the vegetables, followed by the shredded mozzarella and sliced mushrooms.
- Whisk the eggs, heavy cream, ground mustard, garlic powder, salt, and black pepper together in a medium bowl.
- Gently pour the egg mixture around the vegetables so they stay in place. Use a fork to rearrange any pieces that move.
- Bake for 40 to 45 minutes, until a toothpick inserted in the center comes out clean.
- Remove the quiche from the oven and let it cool. Slice and serve with toppings such as hot sauce, salsa, avocado, or sour cream.
How to tell when the quiche is done
Begin checking near the 40-minute mark. The edges should look set, and the center should no longer appear liquid when the dish is gently nudged. A toothpick inserted through the middle should come out clean. If the top is browning before the center sets, loosely cover it with foil and continue baking until the doneness test is met.
Serving ideas
Cut the quiche into eight wedges and serve it with fresh fruit, toast, or a crisp green salad. Hot sauce adds heat, salsa adds acidity, and avocado brings a creamy contrast. For brunch, place the toppings in small bowls so everyone can finish a slice to taste.
This is also a useful make-ahead breakfast. Let the baked quiche cool enough to slice cleanly, then portion it for quick breakfasts or a light lunch with greens.
Tips and optional variation
Tip: Whisk the ground mustard into the eggs thoroughly so it disperses instead of collecting in small clumps. Pour slowly around the vegetables, then use a fork to settle any pieces that float or shift.
Optional variation: Replace the mozzarella with cheddar or Parmesan, or use Greek yogurt or sour cream in place of the heavy cream. These are optional adaptations; keep the primary recipe quantities and baking cues unchanged when making the original version.
Storage and reheating
Cool leftovers before covering and refrigerating them. Reheat individual slices gently in the microwave until warmed through, or use a moderate oven for a firmer edge. Avoid overheating, since eggs can become rubbery when cooked aggressively. If you are packing a cold slice for later, keep it chilled until serving.
Search-query answers
Can you make quiche without a crust?
Yes. Eggs, cream, vegetables, and cheese set into a sliceable bake without pastry. A greased dish helps the edges release.
What vegetables go with mushrooms in quiche?
Spinach, onion, and tomatoes work especially well with mushrooms because they add freshness, sweetness, and color while the eggs provide a mild base.
How do you keep crustless quiche from being watery?
Use the stated vegetable amounts, bake until the center is set, and allow the quiche to cool briefly before slicing. The clean-toothpick test is the best guide.
FAQs and frequently asked questions
A simple vegetable breakfast
With a short ingredient list and a straightforward bake, this mushroom crustless quiche is easy to fit into a breakfast or brunch menu. The mushrooms, spinach, tomatoes, and cheese make each slice colorful, while the seasoned egg mixture keeps the texture tender. Add your favorite topping at the table and serve the wedges while they are warm and easy to cut.
Mushroom Crustless Quiche: Easy Vegetable Breakfast
Adjust the serving amount to scale the ingredient list. Written quantities in the steps refer to the original recipe; adjust them in the same proportion. Timing may vary with batch size.
Ingredients
Ingredients
- 1 cup yellow onion diced
- 1 cup baby spinach chopped
- 1 cup cherry tomatoes sliced in half
- 1/2 cup mozzarella cheese shredded
- 1/2 cup mushrooms sliced
- 8 large eggs none
- 1/2 cup heavy cream none
- 1/2 teaspoon ground mustard none
- 1/2 teaspoon garlic powder none
- 1/2 teaspoon salt none
- 1/4 teaspoon ground black pepper none
Instructions
Instructions
- Preheat the oven to 350°F. Spray a quiche pan or pie dish with nonstick cooking spray and set it on a baking sheet.
- Add the diced onion to the dish, then sprinkle the chopped spinach over it.
- Arrange the halved cherry tomatoes over the vegetables, followed by the shredded mozzarella and sliced mushrooms.
- Whisk the eggs, heavy cream, ground mustard, garlic powder, salt, and black pepper together in a medium bowl.
- Gently pour the egg mixture around the vegetables so they stay in place. Use a fork to rearrange any pieces that move.
- Bake for 40 to 45 minutes, until a toothpick inserted in the center comes out clean.
- Remove the quiche from the oven and let it cool. Slice and serve with toppings such as hot sauce, salsa, avocado, or sour cream.
