Johnson's Caramelized Onion & Mushroom Quiche

By AislePrompt Editorial · Published 2026-04-06 · Updated 2026-04-06

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.

Ingredients

• 1.5 cups all-purpose flour
• 6 tbsp cold unsalted butter
• 4 large eggs
• 1 cup heavy cream
• 8 oz cremini mushrooms
• 2 medium yellow onions
• 3 tbsp fresh parsley
• 1 tsp salt
• 1/4 tsp nutmeg

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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.