Johnson's Caramelized Onion & Mushroom Quiche

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A savory French-inspired quiche with sweet onions, earthy mushrooms, and a flaky crust. This French-inspired quick recipe (vegetarian), ready in about 90 minutes, pairs all-purpose flour, cold unsalted butter, large eggs for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 8, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 45 min Cook: 45 min Serves 8 French cuisine 320 cal/serving
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Ingredients

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Instructions

  1. Step 1: For crust: Pulse 1.5 cups all-purpose flour and 1 tsp salt in a food processor. Add 6 tbsp cold unsalted butter and pulse until mixture resembles coarse sand. Add 2 tbsp ice water and pulse until dough forms. Press into a 9-inch pie plate, chill for 30 minutes.
  2. Step 2: Preheat oven to 375°F. Blind-bake crust for 15 minutes, then set aside. Sauté 8 oz sliced cremini mushrooms and 2 diced yellow onions in a skillet over medium heat with 1 tsp salt until deeply caramelized (15-18 minutes), stirring occasionally.
  3. Step 3: Whisk 4 large eggs, 1 cup heavy cream, 1/4 tsp nutmeg, and 1 tsp salt in a bowl. Stir in 3 tbsp chopped fresh parsley and 2 cups caramelized mushrooms/onions.
  4. Step 4: Pour egg mixture into the pre-baked crust. Bake for 35-40 minutes until center is set and golden. Let rest 10 minutes before slicing.

Frequently asked questions

How long does Johnson's Caramelized Onion & Mushroom Quiche take to make?

Total time is about 90 minutes (45 min prep + 45 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Johnson's Caramelized Onion & Mushroom Quiche?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep all-purpose flour from drying out.

Can I substitute ingredients in Johnson's Caramelized Onion & Mushroom Quiche?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Johnson's Caramelized Onion & Mushroom Quiche for a different number of people?

The recipe is written for 8 servings. Multiply each ingredient by (your serving target / 8). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Johnson's Caramelized Onion & Mushroom Quiche vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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