Name: Crustless Zucchini Quiche Recipe
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Ingredients: 2 medium zucchini, about 1 pound total, grated or very thinly sliced; 1 small yellow onion, finely diced; 2 cloves garlic, minced; 6 large eggs; 1 cup whole milk or half-and-half; 1 cup shredded cheese, such as sharp cheddar, Gruyère, or a blend; 1/4 cup grated Parmesan cheese; 2 tablespoons fresh parsley or basil, chopped; 2 tablespoons olive oil or melted butter; 1/3 cup all-purpose flour or gluten-free all-purpose blend; 1 teaspoon baking powder; 1 teaspoon kosher salt; 1/2 teaspoon black pepper; 1/2 teaspoon dried Italian seasoning or dried thyme; 1 pinch red pepper flakes; 1/2 cup cooked and crumbled bacon or breakfast sausage; 1/2 cup diced cooked ham; 1/2 cup chopped baby spinach; 1/4 cup chopped sun-dried tomatoes, oil-packed and drained; 1/4 cup crumbled feta or goat cheese

Crustless Zucchini Quiche Recipe tastes light, cheesy, and savory with tender zucchini and a golden top, perfect for breakfast, brunch, or a quick dinner. It works well for busy home cooks who want a low-carb, veggie-packed meal on the table in about 45 minutes. I first tested this version during a chaotic Sunday brunch with family, and it saved my sanity and my reputation.

Why Choose This Crustless Zucchini Quiche Recipe

This quiche skips the crust, so you cut carbs and save time without losing flavor. The zucchini keeps the filling moist and tender, while the cheese adds richness and a little salty bite.

You mix everything in one bowl, pour it into a pan, and bake until puffed and golden. Cleanup stays easy, and the recipe fits gluten-free and vegetarian eaters with simple ingredient swaps.

“This Crustless Zucchini Quiche Recipe tasted like a fancy brunch from a café, but I made it in my tiny kitchen in under an hour. ★★★★★”

Ingredients You’ll Need

Fresh ingredients

2 medium zucchini, about 1 pound total, grated or very thinly sliced
1 small yellow onion, finely diced
2 cloves garlic, minced
6 large eggs
1 cup whole milk or half-and-half
1 cup shredded cheese, such as sharp cheddar, Gruyère, or a blend
1/4 cup grated Parmesan cheese
2 tablespoons fresh parsley or basil, chopped (optional but tasty)

Pantry staples

2 tablespoons olive oil or melted butter
1/3 cup all-purpose flour or gluten-free all-purpose blend
1 teaspoon baking powder
1 teaspoon kosher salt
1/2 teaspoon black pepper
1/2 teaspoon dried Italian seasoning or dried thyme
Pinch of red pepper flakes (optional, for a little heat)

Use any neutral oil if you do not keep olive oil on hand. A pre-shredded cheese blend from the store works fine, though you get better melt and flavor if you shred a block yourself.

Optional add-ins

1/2 cup cooked and crumbled bacon or breakfast sausage
1/2 cup diced cooked ham
1/2 cup chopped baby spinach
1/4 cup chopped sun-dried tomatoes (oil-packed, drained)
1/4 cup crumbled feta or goat cheese

You can mix and match these add-ins, but keep the total around 1 cup so the quiche sets properly. Use leftover roasted vegetables as a shortcut and reduce food waste.

Equipment

9-inch pie dish or 9-inch square baking dish
Large mixing bowl
Whisk
Box grater or food processor with grating disc for the zucchini
Skillet for sautéing onion and garlic
Measuring cups and spoons

Grease the baking dish well so slices release cleanly. A glass or ceramic dish works best, since it heats gently and keeps the quiche tender.

Tips & Tricks

Squeeze extra moisture from the grated zucchini with a clean kitchen towel or paper towels so the quiche does not turn watery.
Sauté the onion and garlic until they turn soft and lightly golden to add sweetness and depth.
Use whole milk or half-and-half for a creamy texture; skim milk can make the quiche feel rubbery.
Let the eggs and dairy sit at room temperature for 10 to 15 minutes so they blend smoothly.
Shred cheese from a block when possible, since bagged shreds often contain starch that affects melting.
Do not overmix the batter; whisk until combined, then stop to keep the texture tender.
Bake on the middle rack so the top browns evenly without burning.
Let the quiche rest 10 minutes before slicing so it sets and cuts cleanly.
Add a little extra salt if you skip bacon, ham, or feta, since those ingredients bring saltiness.
Test doneness by inserting a knife near the center; it should come out mostly clean with just a few moist crumbs.

How to Make Crustless Zucchini Quiche Recipe

Step 1: Prep the oven and pan

Preheat your oven to 375°F. Grease a 9-inch pie dish or 9-inch square baking dish with butter or oil, coating the bottom and sides. Set the dish aside while you prep the vegetables.

Step 2: Prep and drain the zucchini

Wash the zucchini and trim the ends. Grate it on the large holes of a box grater or slice it very thinly. Place the zucchini in a colander, sprinkle with a pinch of salt, and let it sit for 5 to 10 minutes, then squeeze out as much liquid as you can with your hands or a clean towel.

Step 3: Sauté the aromatics

Heat the olive oil or butter in a skillet over medium heat. Add the diced onion and cook until it turns soft and lightly golden, about 5 to 7 minutes. Stir in the minced garlic and cook 30 to 60 seconds, just until fragrant, then remove from heat.

Step 4: Mix the dry ingredients

In a large mixing bowl, whisk together the flour, baking powder, salt, black pepper, Italian seasoning, and red pepper flakes if you use them. Break up any flour clumps. This step helps the flour distribute evenly in the egg mixture.

Step 5: Whisk the eggs and dairy

Crack the eggs into the bowl with the dry ingredients. Add the milk or half-and-half. Whisk until the mixture turns smooth and slightly frothy, scraping the sides of the bowl as needed.

Step 6: Add vegetables and cheese

Fold the drained zucchini, sautéed onion and garlic, shredded cheese, Parmesan, and fresh herbs into the egg mixture. Add any optional cooked meats or extra vegetables at this point. Stir gently until everything looks evenly distributed.

Step 7: Fill the baking dish

Pour the mixture into the greased baking dish and smooth the top with a spatula. Sprinkle a little extra cheese on top if you want a more golden crusty layer. Tap the dish lightly on the counter to release any air bubbles.

Step 8: Bake

Place the dish on the middle rack of the oven. Bake for 30 to 40 minutes, until the top turns golden and a knife inserted near the center comes out mostly clean. If the top browns too quickly, tent the dish loosely with foil during the last 5 to 10 minutes.

Step 9: Rest and serve

Remove the quiche from the oven and set it on a cooling rack. Let it rest for about 10 minutes so the filling sets. Slice into wedges or squares and serve warm, at room temperature, or chilled.

What to Serve with Crustless Zucchini Quiche Recipe

This Crustless Zucchini Quiche Recipe pairs nicely with a simple green salad with lemony vinaigrette or a crisp cucumber salad. Add a side of fresh fruit like berries, melon, or orange slices for a bright contrast. Serve it with roasted potatoes or sweet potatoes if you want a heartier meal. Offer coffee, hot tea, or a tall glass of iced tea or sparkling water with lemon for a complete brunch plate.

Storage Options

Cool leftovers completely, then cover the dish tightly or transfer slices to an airtight container and refrigerate for up to 4 days.
Freeze individual slices wrapped in plastic or foil, then place them in a freezer bag and store for up to 2 months.
Reheat refrigerated slices in a 325°F oven for 10 to 15 minutes until hot, or warm them gently in a skillet over low heat with a lid.
Reheat frozen slices in the oven at 325°F for 20 to 25 minutes, or thaw overnight in the fridge first for quicker heating.