Ultimate Roasted Vegetable Crustless Quiche
Introduction
This roasted vegetable crustless quiche is a colorful, satisfying dish packed with tender vegetables, creamy eggs, and melted cheese.
Without a pastry crust, it is naturally gluten-free and makes an excellent option for easy vegetarian meals, healthy breakfast recipes, brunch ideas, and meal prep.
Roasting the vegetables first concentrates their flavor while removing excess moisture, helping create a beautifully firm and creamy egg custard.
Recipe Overview
| Detail | Information |
| Preparation Time | 20 minutes |
| Roasting Time | 25 minutes |
| Quiche Baking Time | 45–55 minutes |
| Total Time | 1 hour 30 minutes |
| Yield | 8 slices |
| Difficulty | Easy |
| Diet | Vegetarian, Gluten-Free |
| Oven Temperature | 400°F (200°C), then 350°F (180°C) |
Why You’ll Love This Recipe
This crustless quiche combines the rich texture of a traditional quiche with the convenience of a simple vegetable bake.
The roasted zucchini, cherry tomatoes, butternut squash, and red onion create layers of sweet and savory flavor.
Skipping the pastry crust also makes the recipe lighter and naturally gluten-free.
It is an excellent make-ahead breakfast recipe because individual slices can be refrigerated and reheated throughout the week.
The colorful vegetables also make this dish beautiful enough for a weekend brunch or dinner gathering.
Ingredients
Egg Custard
| Ingredient | Quantity | Preparation |
| Large eggs | 8 | Room temperature |
| Heavy cream or whole milk | 120 ml (½ cup) | Use unsweetened milk if preferred |
| Gruyère or sharp Cheddar | 100 g | Freshly grated |
| Fresh thyme | 1 tablespoon | Chopped |
| Garlic powder | 1 teaspoon | For seasoning |
| Salt | To taste | Adjust as needed |
| Black pepper | To taste | Freshly ground preferred |
Roasted Vegetables
| Ingredient | Quantity | Preparation |
| Zucchini | 2 medium | Cut into half-moons |
| Cherry tomatoes | 150 g | Halved |
| Butternut squash | 200 g | Peeled and diced |
| Red onion | 1 small | Thinly sliced |
| Extra-virgin olive oil | 2 tablespoons | Divided |
For the Pan
| Ingredient | Quantity |
| Butter or cooking spray | As needed |
| Parchment paper | 1 sheet |
Step-by-Step Instructions
Prepare the Pan
Preheat the oven to 400°F (200°C).
Line the bottom of a deep 8-inch springform pan with parchment paper.
Lightly grease the sides to make removing the quiche easier.
Roast the Butternut Squash and Onion
Place the diced butternut squash and sliced red onion on a large baking sheet.
Add 1 tablespoon of olive oil.
Season with salt and black pepper.
Toss everything until evenly coated.
Spread the vegetables into a single layer.
Roast for approximately 15 minutes.
The squash should begin to soften but should not be completely cooked.
Add the Remaining Vegetables
Reduce the oven temperature to 350°F (180°C).
Add the zucchini and halved cherry tomatoes to the roasting pan.
Drizzle with the remaining tablespoon of olive oil.
Sprinkle with garlic powder and a little additional salt and pepper.
Roast for another 10 minutes.
The vegetables should be tender and slightly caramelized.
Allow them to cool for several minutes.
Prepare the Egg Mixture
Crack the eggs into a large mixing bowl.
Add the cream or milk, grated cheese, fresh thyme, salt, and black pepper.
Whisk until the mixture is completely combined.
Avoid excessively vigorous whisking because too much incorporated air can cause the quiche to puff dramatically and then sink as it cools.
Combine the Vegetables and Custard
Add the roasted vegetables to the egg mixture.
Gently fold everything together.
Try to distribute the vegetables evenly throughout the custard.
Fill the Pan
Pour the mixture into the prepared springform pan.
Use a spatula to spread the vegetables evenly.
Gently tap the pan on the counter once or twice to remove large air pockets.
Bake the Quiche
Place the pan on the center rack of the oven.
Bake at 350°F (180°C) for approximately 45–55 minutes.
The edges should be completely set while the center should have only a slight jiggle.
If the top becomes golden too quickly, loosely cover it with foil during the final part of baking.
Cool Before Slicing
Remove the quiche from the oven.
Let it rest in the pan for at least 15 minutes.
Carefully release the springform ring.
Allowing the quiche to cool slightly helps the custard finish setting and makes cleaner slices possible.
Best Tips
Roasting the vegetables before adding them to the custard is one of the most important steps.
Vegetables naturally contain a significant amount of water, and roasting helps remove some of that moisture.
Cut the vegetables into relatively similar sizes so they cook evenly.
Keep the tomatoes cut-side up when possible to encourage moisture evaporation.
For a taller quiche, use a deep 8-inch pan rather than a large, shallow pie dish.
Let the finished quiche rest before slicing.
Best Ingredient Options
Cheese
Gruyère creates a rich, nutty flavor and melts beautifully.
Sharp Cheddar gives the quiche a stronger, more pronounced cheese flavor.
Feta can be used for a salty Mediterranean-style variation.
Mozzarella provides a mild flavor and soft, creamy texture.
Dairy
Heavy cream produces the richest custard.
Whole milk creates a slightly lighter result while maintaining good creaminess.
Unsweetened milk alternatives can also be used, although the final texture may be less rich.
Vegetables
You can substitute some of the vegetables according to the season.
Broccoli, spinach, bell peppers, mushrooms, asparagus, and roasted eggplant can all work well.
Recipe Variations
High-Protein Vegetable Quiche
Add approximately ½ cup of cooked diced chicken or turkey for a more substantial meal.
Make sure any meat added to the recipe is fully cooked before combining it with the eggs.
Mediterranean Vegetable Quiche
Replace some of the butternut squash with roasted eggplant.
Add chopped sun-dried tomatoes, olives, feta, and oregano for a Mediterranean-inspired flavor.
Low-Carb Vegetable Quiche
For a lower-carbohydrate version, replace the butternut squash with broccoli, spinach, mushrooms, or bell peppers.
Spinach and Mushroom Quiche
Sauté sliced mushrooms and spinach before adding them to the egg mixture.
Cook them until excess moisture has evaporated.
Cheddar and Broccoli Quiche
Replace the zucchini and tomatoes with roasted broccoli florets.
Use sharp Cheddar for a classic combination.
What to Serve With
Serve this roasted vegetable quiche with a fresh green salad.
Arugula, cucumber, lemon juice, and extra-virgin olive oil provide a refreshing contrast to the creamy custard.
For brunch, pair it with fresh berries and seasonal fruit.
A bowl of tomato or vegetable soup can also turn a slice of quiche into a comforting lunch.
For a more complete dinner, serve it alongside roasted vegetables and a simple mixed salad.
Make-Ahead Instructions
This quiche is excellent for meal preparation.
You can roast the vegetables a day in advance and refrigerate them in an airtight container.
The complete quiche can also be baked ahead of time.
Allow it to cool completely before covering and refrigerating.
Storage
Store leftover quiche in an airtight container in the refrigerator.
It will generally keep well for 3–4 days when properly refrigerated.
Individual slices are convenient for quick breakfasts and lunches during the week.
Reheating
For the best texture, reheat individual slices in a conventional oven.
Place a slice in an oven-safe dish and heat at 325°F (165°C) until warmed through.
An air fryer can also be used at a moderate temperature for a quicker option.
Microwaving works when convenience is more important than texture, although the crustless quiche may become slightly softer.
Freezing
Allow the baked quiche to cool completely.
Cut it into individual portions before freezing for easier meal preparation.
Wrap each slice tightly and place the portions in a freezer-safe container.
Freeze for up to 2 months for the best quality.
Thaw overnight in the refrigerator before reheating.
Common Mistakes to Avoid
Adding Raw, Watery Vegetables
Vegetables such as zucchini and tomatoes release moisture as they cook.
Roasting them first helps prevent a watery quiche.
Using a Shallow Pan
A shallow dish will produce a wider and thinner quiche.
For the impressive height of this recipe, use a deep 8-inch pan.
Overbaking
An overbaked custard can become rubbery and dry.
Remove the quiche when the center is set but still has a slight gentle jiggle.
Cutting Too Soon
Slicing immediately after removing the quiche from the oven can cause the filling to fall apart.
Give it at least 15 minutes to rest.
Overloading the Filling
Too many vegetables can prevent the egg custard from setting properly.
Keep the vegetable-to-custard ratio balanced.
Nutrition Estimate
| Nutrient | Approximate Amount Per Slice |
| Calories | 250–300 kcal |
| Protein | 13–16 g |
| Carbohydrates | 9–13 g |
| Fat | 18–22 g |
| Saturated Fat | 8–11 g |
| Fiber | 2–3 g |
| Sugar | 4–6 g |
| Sodium | 350–500 mg |
Nutrition values are estimates and will vary depending on the cheese, dairy, portion size, and other ingredients used.
Frequently Asked Questions
Can I make this quiche without a springform pan?
Yes.
A deep 8- or 9-inch cake pan or deep pie dish can work.
Grease it thoroughly and line the bottom with parchment paper if possible.
Can I use frozen vegetables?
Yes, but thaw and drain them thoroughly first.
Excess water can make the custard watery.
Can I use milk instead of heavy cream?
Yes.
Whole milk works particularly well if you want a lighter custard.
Why is my crustless quiche watery?
The most common reason is excess moisture from the vegetables.
Roast watery vegetables before adding them to the egg mixture, and avoid adding vegetables while they are still releasing liquid.
How do I know when the quiche is done?
The edges should be firm and the center should have a slight jiggle.
The internal temperature should reach approximately 160°F (71°C) for an egg-based dish.
Can I make individual mini quiches?
Yes.
Divide the mixture among greased muffin tins or individual ramekins.
Because smaller portions cook faster, begin checking them well before the full-size quiche’s cooking time.
Final Thoughts
This roasted vegetable crustless quiche is a simple way to turn fresh vegetables, eggs, and cheese into a satisfying homemade meal.
Roasting the vegetables first gives the dish deeper flavor while helping create a creamy, well-set custard.
Whether you’re preparing a healthy breakfast, weekend brunch, vegetarian dinner, or meal-prep recipe, this colorful quiche is easy to customize and simple to make ahead.
Serve it warm, at room temperature, or chilled for a versatile homemade meal that works beautifully any time of day.