Caramelized Onion Gruyere and Spinach Crustless Quiche

Elevate your brunch game with this elegant Caramelized Onion Gruyere and Spinach Crustless Quiche—where rich flavors meet a low-carb twist. This recipe combines golden, melt-in-your-mouth caramelized onions, tender sautéed spinach, and creamy, nutty Gruyere cheese in a luscious egg custard baked to perfection. With no crust to fuss over, it’s both gluten-free and delightfully easy to prepare, perfect for family meals or meal prepping. Enhanced with a hint of nutmeg for depth, this quiche is as versatile as it is delicious—serve it warm straight from the oven or enjoy it chilled the next day. Whether you're hosting a weekend gathering or savoring a cozy breakfast, this crustless quiche is sure to impress!

Nutriscore Rating: 60/100

Prep Time:20 mins

Cook Time:50 mins

Total Time:70 mins

Servings: 6

Ingredients

• 2 tablespoons unsalted butter
• 1 tablespoon olive oil
• 2 medium yellow onion (thinly sliced)
• 4 cups baby spinach
• 6 large eggs
• 1 cup heavy cream
• 0.5 cup whole milk
• 1 cup gruyere cheese (shredded)
• 0.5 teaspoon salt
• 0.25 teaspoon ground black pepper
• 0.125 teaspoon nutmeg (optional)
• 1 as needed cooking spray or butter (for greasing the dish)

Directions

Step 1

Preheat your oven to 375°F (190°C). Grease a 9-inch pie dish or quiche pan with cooking spray or butter and set aside.

Step 2

In a large skillet, heat the unsalted butter and olive oil over medium heat until melted. Add the thinly sliced onions and cook, stirring occasionally, for about 20-25 minutes until they are golden brown and caramelized. Reduce the heat if they start to brown too quickly. Remove from the skillet and set aside.

Step 3

In the same skillet, add the baby spinach and sauté for 2-3 minutes until wilted. Remove from the heat and allow it to cool slightly.

Step 4

In a mixing bowl, whisk together the eggs, heavy cream, whole milk, salt, black pepper, and nutmeg (if using) until fully combined.

Step 5

Spread the caramelized onions evenly across the bottom of the prepared pie dish, followed by the wilted spinach. Sprinkle the shredded gruyere cheese evenly over the top.

Step 6

Pour the egg mixture into the pie dish, ensuring it spreads evenly and covers the vegetables and cheese.

Step 7

Transfer the dish to the preheated oven and bake for 35-40 minutes, or until the quiche is set in the middle and lightly golden on top. To check doneness, insert a knife into the center—if it comes out clean, the quiche is ready.

Step 8

Remove the quiche from the oven and let it rest for 5-10 minutes before slicing and serving. Enjoy warm or at room temperature.

Nutrition Facts

Serving size	(1240.1g)

Amount per serving	% Daily Value*
Calories	2218.2

Total Fat 188.5g	0%
Saturated Fat 95.6g	0%
Polyunsaturated Fat 1.5g
Cholesterol 1552.6mg	0%
Sodium 2073.8mg	0%
Total Carbohydrate 44.8g	0%
Dietary Fiber 8.2g	0%
Total Sugars 18.7g
Protein 78.4g	0%

Vitamin D 317.7IU	0%
Calcium 1509.0mg	0%
Iron 11.1mg	0%
Potassium 1129.4mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 77.5%

Protein: 14.3%

Carbs: 8.2%