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Instructions
- Preheat and prep your dish. Preheat oven to 350°F (175°C). Generously butter a 9-inch pie dish or deep-dish quiche pan, making sure to coat the sides well. This creates a subtle golden edge and prevents sticking. Without a crust, proper greasing is crucial.
- Prepare your fillings. If using bacon, cook in a skillet over medium heat until crispy, about 8 minutes, then crumble. If using spinach, wilt in the same skillet and squeeze completely dry in a kitchen towel. If using mushrooms, sauté until golden and all moisture has evaporated, about 6 minutes. Set all fillings aside to cool slightly.
- Make the custard. In a large bowl, whisk the eggs until smooth and no streaks remain. Add heavy cream, milk, salt, pepper, and nutmeg. Whisk vigorously until completely combined and the mixture is pale yellow and slightly frothy. This aeration creates a lighter texture.
- Layer the cheese and fillings. Sprinkle 1 cup of shredded Gruyère evenly over the bottom of the buttered dish. This creates a cheese "base" that mimics a crust. Add your choice of prepared fillings — bacon, spinach, mushrooms — distributing them evenly. Top with the remaining ½ cup Gruyère and all of the Parmesan cheese.
- Pour custard and bake. Slowly pour the custard mixture over the cheese and fillings. The cheese and fillings will float slightly — this is completely normal and creates beautiful layers. Place the dish on a baking sheet to catch any overflow. Bake for 35-40 minutes until the edges are set and puffed, and the center has only a very slight jiggle when gently shaken. The top should be golden brown with some darker spots.
- Cool before slicing. Let the quiche cool on a wire rack for 10-15 minutes. Without a crust to provide structure, this cooling time is essential for the custard to fully set. The quiche will deflate slightly as it cools — this is normal. Garnish with sliced green onions and serve warm or at room temperature.
Equipment for this recipe
No crust means no pan weights and no rolling pin — the list gets shorter.
- Deep-dish ceramic pie dish — holds heat gently and evenly, and goes straight from oven to table
- Box grater — with no crust, cheese does more of the structural work — grate it fresh
- Instant-read thermometer — a crustless quiche has no pastry buffer, so the doneness window is even tighter
- Wire cooling rack — air under the dish stops the base steaming during the rest
Keto Success Tips
- Net carbs explained — This recipe has 4g total carbs and 1g fiber per serving, making it 3g net carbs. Perfect for staying in ketosis.
- Butter the dish generously — Without a crust, the butter creates a golden edge and prevents sticking. Don't skimp on this step.
- Use full-fat dairy only — Low-fat cream or milk will add carbs without the richness. Heavy cream is essential for keto macros.
- Dry your fillings thoroughly — Excess moisture can make the quiche watery. Squeeze spinach hard, cook mushrooms until dry, drain bacon well.
- Room temperature eggs — They blend more smoothly and create a more consistent custard texture.
- The deflation is normal — Crustless quiches puff dramatically in the oven and settle as they cool. The texture will still be perfect.
Keto Filling Variations
All variations maintain under 5g net carbs per serving:
- Classic Bacon & Cheddar: 6 oz bacon + 1½ cups sharp cheddar + ¼ cup green onions (3g net carbs)
- Spinach & Feta: 2 cups spinach + 1 cup feta + ½ cup Parmesan + 2 cloves garlic (3.5g net carbs)
- Mushroom Gruyère: 1½ cups mushrooms + 1½ cups Gruyère + 1 tbsp fresh thyme (3g net carbs)
- Italian Sausage: 8 oz cooked Italian sausage + 1 cup mozzarella + ½ cup Parmesan + basil (2.5g net carbs)
- Smoked Salmon & Dill: 6 oz smoked salmon + 1 cup cream cheese + 2 tbsp dill + capers (2g net carbs)
- Ham & Swiss: 1 cup diced ham + 1½ cups Swiss cheese + 1 tsp Dijon mustard (3g net carbs)
Making It Dairy-Free
The custard sets on egg protein, not on dairy fat, so a crustless quiche takes a dairy-free swap better than a crusted one does. Replace the 1½ cups of heavy cream with 1 cup full-fat canned coconut milk plus ½ cup unsweetened almond milk — the coconut fat carries the richness, the almond milk keeps it from tasting like dessert. Butter the dish with olive oil instead, and drop the cheese or use a firm dairy-free alternative.
It stays sugar-free and low carb either way: coconut milk adds roughly 1g of carbs per serving. If you want a fully plant-based version with no eggs at all, our silken tofu and chickpea flour vegan quiche is built for it from the start.
Still Liquid in the Middle?
This is the most common crustless complaint, and it is almost always one of two things:
- It is underbaked, not broken. Without a crust the custard sits directly against a cold ceramic dish, which slows the center by 5–10 minutes compared with a crusted quiche. Take it to 170–175 °F (77–79 °C) in the middle, not to a clock.
- The fillings released water. Spinach, mushrooms and tomatoes carry more liquid than the custard can absorb. Squeeze, cook down or drain them before they go in.
The full diagnosis, including what to do with a quiche you have already cut into, is in why is my quiche watery — 5 causes and fixes.
Meal Prep & Storage
Refrigerate: Cover tightly and store up to 5 days. Perfect for keto meal prep — makes 8 breakfast servings.
Freeze: Wrap individual slices in plastic wrap, then place in a freezer bag. Freeze up to 3 months. Thaw overnight in fridge.
Reheat: From fridge: Microwave 60-90 seconds or bake at 350°F for 12 minutes. From frozen: Microwave 2-3 minutes or bake at 325°F for 20 minutes.
Meal prep tip: Slice into 8 portions, wrap individually, and refrigerate. Grab one each morning for a protein-packed, keto-friendly breakfast that keeps you full until lunch.
Why Crustless?
Traditional quiche crust adds 15-20g of carbs per slice — nearly an entire day's carb allowance on strict keto. By removing the crust:
- You save 15-17g net carbs per serving
- Prep time drops by 20 minutes (no blind baking required)
- The recipe becomes naturally gluten-free
- You get more room for delicious, protein-rich fillings
- The custard-to-filling ratio improves, creating a silkier texture
The result? A quiche that's just as satisfying as the original, with macros that fit perfectly into a low-carb lifestyle.
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Last reviewed on April 24, 2026. Recipes and guides are reviewed periodically and updated when we find a better method or a genuine error — see our Disclaimer.