Introduction

Crustless quiche is a versatile, light, and satisfying dish perfect for any meal of the day. Packed with eggs, cheese, and your favorite mix-ins, it delivers all the rich flavors of traditional quiche without the extra crust. Easy to prepare and bake, it’s a great way to use leftover vegetables or meats.

A thick round frittata sits on a white plate over a white marbled surface, with a slice cut out and slightly pulled away so its inside is visible. The frittata has three visible layers: a golden-brown crusty top layer with scattered green herbs, a middle layer filled with chunks of white cheese and small pieces of orange vegetable, and a light yellow egg base with green herb specks mixed throughout. The texture looks fluffy and firm, and the top is slightly browned and shiny. Loose bits of green herbs are sprinkled on the plate around the frittata photo taken with an iphone --ar 4:5 --v 7

Ingredients

6 large eggs
⅔ cup whole milk
¼ cup half-and-half
½ teaspoon kosher salt
¼ teaspoon ground black pepper
1 teaspoon Dijon mustard (optional)
Pinch ground nutmeg (optional)
1 ½ cups mix-ins of choice (e.g., ⅔ cup grated Gruyère cheese, 2 tablespoons chopped fresh chives, cooked crumbled lean beef, chopped and sautéed broccoli, caramelized onions, cubed leftover roast beef, roasted vegetables)

Instructions

Step 1: Preheat oven to 375°F (190°C). Generously grease a 9-inch pie dish or similar-sized oven-safe baking dish with butter or cooking spray, ensuring all surfaces are coated to prevent sticking.
Step 2: Prepare your chosen vegetables: thoroughly thaw and squeeze dry any frozen spinach; finely dice onions; slice mushrooms. Heat 1 tablespoon butter or olive oil in a medium skillet over medium heat. Sauté onions for 3-5 minutes until translucent, then add mushrooms and other hardier vegetables (like bell peppers or broccoli) and cook for 5-7 minutes until softened and moisture is released. If using, prepare cooked crumbled lean beef or cubed leftover roast beef. Set all cooked fillings aside to cool slightly.
Step 3: In a large mixing bowl, vigorously whisk the 6 large eggs until yolks and whites are fully combined and slightly frothy (about 1-2 minutes). Pour in the ⅔ cup whole milk and ¼ cup half-and-half. Add ½ teaspoon kosher salt, ¼ teaspoon ground black pepper, 1 teaspoon Dijon mustard (if using), and a pinch of ground nutmeg (if using). Whisk all ingredients thoroughly until well incorporated, forming a homogenous base.
Step 4: Add your 1 ½ cups of mix-ins, including the ⅔ cup grated Gruyère cheese, 2 tablespoons chopped fresh chives, and your cooled sautéed vegetables/prepared lean beef/roast beef, directly into the egg and dairy mixture. Gently fold with a spatula until all fillings are evenly distributed throughout the egg base, avoiding overmixing.
Step 5: Carefully pour the entire quiche mixture into your generously greased 9-inch pie dish. Place the dish into the preheated 375°F (190°C) oven and bake for 40 to 55 minutes. The quiche is done when the top is golden brown and the center is set, showing only a slight, uniform jiggle when gently moved. If the top browns too quickly, loosely tent with aluminum foil for the last 10-15 minutes of baking.
Step 6: Once baked, carefully remove the quiche from the oven. Allow it to cool on a wire rack for at least 10-15 minutes (up to 20 minutes) before slicing. This crucial cooling period allows the custardy filling to fully set, ensuring clean and beautiful slices. Serve warm, either on its own or with a fresh green salad for a complete meal.

Tips & Variations

Use a mix of cheeses like Gruyère, cheddar, or feta for different flavor profiles.
Add fresh herbs such as thyme, parsley, or dill for extra aroma.
Swap the half-and-half for cream for a richer quiche, or use all milk for a lighter version.
Make sure all cooked vegetables are well-drained to avoid a soggy quiche.
Try different protein additions like diced ham, cooked bacon, or smoked salmon.

Storage

Store any leftover quiche covered in the refrigerator for up to 3 days. Reheat slices gently in the microwave or in a low oven (around 325°F/160°C) until warmed through. For longer storage, you can freeze the quiche wrapped tightly in foil or plastic wrap for up to 1 month; thaw overnight in the fridge before reheating.

How to Serve

A thick single slice of baked egg dish stands on a white plate against a white marbled background. The slice shows a golden-brown top layer with a slightly crispy look mixed with melted cheese bits and sprinkled with chopped green herbs. The middle layer is light yellow and creamy with visible chunks of white cheese and green leafy vegetables spread throughout, giving it a soft and fluffy texture. Small pieces of herbs are also scattered on the plate around the slice. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this quiche ahead of time?

Yes, you can prepare the quiche mixture and fillings up to a day in advance. Store the mixed ingredients in the refrigerator and bake when ready. Once baked, it also reheats well.

Do I need to use a specific type of cheese?

No; while Gruyère is classic for quiche, you can use any cheese that melts well, such as cheddar, Swiss, feta, or mozzarella, depending on your taste preference.