Vegetarian Quiche Lorraine (No Bacon)

Traditional Quiche Lorraine is made with bacon or lardons, but this vegetarian version swaps the meat for deeply browned mushrooms, leeks, smoked paprika, and Gruyère. You still get a rich, savory filling, creamy custard, and crisp golden crust — without the meat.

The key is cooking the mushrooms and leeks until deeply browned and dry, which concentrates their flavor and prevents a watery quiche.

Why This Works (The Short Version)

Classic quiche lorraine leans on bacon for two things: smoky depth and savory umami. Once you understand that’s the job bacon is doing, you can hire other ingredients to do it:

• Leeks or onions bring sweetness and body
• Cremini mushrooms, cooked until deeply browned, bring the meaty, umami backbone
• A touch of smoked paprika brings the smoke
• Gruyère ties it all together with a nutty, salty finish

Get that combination right, and you get the smoky, savory depth you’d normally expect from the bacon in Quiche Lorraine — without it.

What You’ll Need

(Full ingredient list and method are in the recipe card below — this is just the shopping-list version.)

For the crust: flour, cold butter, salt, ice water

For the filling: eggs, heavy cream, Gruyère, leeks or onion, cremini mushrooms, smoked paprika, nutmeg, salt, pepper, fresh chives

The Techniques That Actually Matter

Three details make a big difference in this vegetarian quiche:

1. Cook your vegetables until the pan looks dry. Mushrooms and leeks are full of water. If you skip this step, that water ends up in your custard during baking, and you get a soggy, weeping slice instead of a clean one. Cook low and slow until you don’t see any liquid left in the pan — it’ll take longer than you think, and that’s fine.

2. Blind-bake the crust. It’s an extra step, but I strongly recommend it. A par-baked crust is the difference between a crisp base and a pale, gummy one hiding under your filling.

3. Pull it while the center still jiggles. The custard keeps cooking from residual heat after it leaves the oven. If you wait for the center to look fully set in the oven, you risk overbaking it, and that’s when you get cracks and a rubbery texture instead of silky.

Vegetarian Quiche Lorraine

Serves 6–8 | Prep: 30 minutes (plus chilling) | Bake: 45 minutes

Ingredients

Crust

• 1¼ cups (155g) all-purpose flour
• ½ tsp salt
• ½ cup (115g) cold unsalted butter, cubed
• 3–4 tbsp ice water

Filling

• 2 tbsp butter
• 2 leeks, white and light green parts, thinly sliced (or 1 large yellow onion)
• 8 oz (225g) cremini mushrooms, sliced
• ½ tsp smoked paprika
• 4 large eggs
• 1 cup (240ml) heavy cream
• ¼ tsp freshly grated nutmeg
• ½ tsp black pepper
• ½ tsp salt (adjust to taste — cheese adds more)
• 1½ cups (150g) grated Gruyère
• 2 tbsp chopped fresh chives

Method

Make the crust

1. Whisk flour and salt together. Cut in the cold butter with a pastry cutter or your fingers until the mixture looks like coarse crumbs — pea-sized pieces of butter are what you’re after.
2. Add ice water one tablespoon at a time, mixing just until the dough holds together when pressed. Don’t overwork it.
3. Shape into a disk, wrap, and chill for at least 30 minutes.
4. Roll out on a floured surface and fit into a 9-inch pie or tart pan. Trim the edges, then chill the shell for another 15 minutes — this helps prevent shrinking.
5. Preheat oven to 375°F (190°C). Line the crust with parchment and fill with pie weights or dried beans. Blind-bake for 15 minutes, then remove the weights and parchment and bake another 5–7 minutes until lightly golden and dry to the touch.

Make the filling 6. Melt butter in a skillet over medium heat. Add leeks and cook until soft, about 5 minutes. Add mushrooms and smoked paprika, and cook until all the liquid has evaporated and the mushrooms are deeply browned — 10–12 minutes. Let cool slightly.

7. In a large bowl, whisk together eggs, cream, nutmeg, pepper, and salt until smooth. Don’t over-whisk — you’re not trying to add air, just combine.

Assemble and bake 8. Scatter the cooked vegetables and half the Gruyère over the base of the warm crust. Pour the custard over the top, then sprinkle with the remaining cheese and chives.

9. Bake at 375°F (190°C) for 35–40 minutes, until the edges are set and the center still has a gentle wobble when you shake the pan. Tent the edges with foil if they start browning too fast.

10. Cool on a wire rack for at least 15 minutes before slicing so the custard has time to set.

Notes

• Make ahead: dough keeps 2 days in the fridge or 1 month frozen. The cooked vegetable filling keeps 2 days refrigerated.
• Storage: covered, up to 3 days in the fridge. For the crispiest crust, reheat in a 325°F oven rather than the microwave.
• Freezing: wrap cooled slices individually; they’ll keep for up to 2 months.
• Swap it up: spinach (squeezed very dry) or roasted red peppers both work well in place of mushrooms.
• Equipment tip: I use a 9-inch tart pan with a removable bottom, which makes it much easier to lift out the quiche cleanly for slicing.

What to Serve With It

A simple arugula salad with a lemon-dijon vinaigrette is really all this needs — something bright and acidic to cut through the richness. If you’re serving it for dinner, a crisp white wine like a Sauvignon Blanc rounds it out nicely.

Quick Troubleshooting

Watery filling? Your vegetables weren’t cooked dry enough — next time, keep going until the pan shows zero liquid.

Soggy bottom? The crust needed a longer blind-bake, or the pie weights weren’t heavy enough to keep it flat.

Cracked top? Oven was too hot, or it stayed in a few minutes too long. Pull it at the jiggle stage.

Bland overall? Season your vegetables before combining with the custard — tasting each component separately is the only way to catch this early.

For more healthy vegetarian meal ideas, check out my 25 Best Vegetarian Recipes.

FAQ

Can you make Quiche Lorraine without bacon? Yes. This vegetarian version replaces the savory and smoky elements of bacon with browned mushrooms, leeks, smoked paprika, and Gruyère.

Can I make vegetarian Quiche Lorraine ahead of time? Yes. You can bake it completely up to a day ahead and reheat gently in a 325°F oven, or prep the components separately — dough, cooked vegetables, and grated cheese all hold in the fridge — and assemble it fresh the day you want to serve it.

Can I use a store-bought pie crust? Yes. A store-bought crust works fine here — just blind-bake it the same way so the base stays crisp under the custard.

Can I make this quiche without mushrooms? Yes. Spinach (squeezed very dry) or roasted red peppers both work well in their place — see the Notes above for other swaps.