Best Ever Spinach Quiche Recipe with Caramelized Onions
This custardy spinach quiche is creamy and full of rich flavors. Caramelized onions, mushrooms and two types of cheese add so much flavor to the creamy custard filling. Spinach makes it a classic no-fail quiche that will transform a boring breakfast, lunch or even dinner. Add some candied bacon and homemade biscuits and breakfast just got a whole lot better!
Ingredients
- 2 sweet onions (thinly sliced)
- 1 tablespoon olive oil
- 3 tablespoons butter (divided)
- ½ teaspoon salt
- pinch sugar
- 2 cloves garlic
- 1 tablespoon olive oil
- 5 cups baby spinach
- 8 ounces mushrooms (sliced)
- 6 large eggs
- 1 ½ cups heavy cream (or whole milk)
- 4 ounces gruyere (grated)
- 4 ounces cheddar cheese (grated)
- ½ teaspoon salt
- ½ teaspoon black pepper
- ¼ teaspoon nutmeg
- 1 pie crust
Instructions
- Preheat oven to 400º. Roll out a pie crust and place it in a deep dish pie pan. Prick with a fork and refrigerate while preparing the filling.
- Add 1 tablespoon olive oil and 1 tablespoon butter to a large skillet. Add onions and toss in oil. Cook on low to medium heat for 15 minutes, then add salt and sugar. Cook for an additional 15 minutes or until golden brown. Set aside.
- In a separate skillet, add 1 tablespoon olive oil and 1 tablespoon butter and heat over medium heat. Add garlic and saute for about 1 minute. Add spinach and a pinch of salt and cook until wilted, about 3 minutes. Remove from pan. In the same pan, add 1 tablespoon butter and saute mushrooms until browned, about 3-5 minutes.
- Add eggs to a large measuring bowl and add enough cream/milk so that the total volume is 3 cups. Whisk until well combined. Add onions, mushrooms, and spinach, once combined add cheese. Season with salt, black pepper, and nutmeg.
- Pour into prepared pie crust. Turn oven down to 375º and bake for 40-50 minutes until the center no longer jiggles.
Barbara's Notes + Tips
- You can caramelize the onions well in advance,
- You can add other cooked veggies to the quiche.
- You can make this and freeze it for later, just warm in the oven at 350º for about 10-15 minutes.
Nutrition
Serving: 1serving | Calories: 520kcal | Carbohydrates: 20g | Protein: 16g | Fat: 42g | Saturated Fat: 22g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 14g | Trans Fat: 0.2g | Cholesterol: 214mg | Sodium: 687mg | Potassium: 430mg | Fiber: 2g | Sugar: 6g | Vitamin A: 3002IU | Vitamin C: 10mg | Calcium: 335mg | Iron: 2mg
