Mini Crustless Caramelized Onion & Cheese Quiches

These crustless mini quiches are packed with savory caramelized onions and flavorful cheese. This technique for making caramelized onions uses way less fat, and by using sweet onions (like Vidalia, if you can find them), you don't need to add the sugar some recipes call for.

a recipe photo of the Mini Crustless Caramelized Onion Quiches served on a plate
Photo: Ali Redmond
Active Time:
1 hr
Total Time:
1 hr 45 mins


  • 2 tablespoons avocado oil or canola oil

  • 2 large sweet onions, halved and sliced 1/4-inch thick

  • 1 teaspoon kosher salt plus a pinch, divided

  • 1 tablespoon water, as needed

  • 5 large eggs

  • 1 ⅓ cups half-and-half

  • teaspoon ground white pepper

  • 1 cup finely shredded Cheddar or Gruyère cheese or crumbled goat or blue cheese

  • ¼ cup chopped walnuts or pecans, toasted (optional; see Tip)

  • 2 teaspoons fresh thyme leaves or finely chopped fresh parsley


  1. Heat oil in a large pot over medium heat. Add onions and 1 teaspoon salt; stir to coat. Reduce heat to low and cook, covered, for 5 minutes. Remove the lid and stir. Cook, uncovered and stirring every few minutes, until the onions are melted and a deep amber brown, 35 to 45 minutes. If fond (brown coating) builds up on the pan, add water, 1 tablespoon at a time, to deglaze the pan, then use a wooden spoon or spatula to scrape all that flavor back into your onions. Transfer the caramelized onions to a large bowl and let cool to room temperature, about 20 minutes.

  2. Preheat oven to 375°F. Coat two 24-cup nonstick mini muffin tins with cooking spray.

  3. Whisk eggs, half-and-half, pepper and the remaining pinch of salt in a large bowl. Combine the onions, cheese, nuts (if using) and thyme (or parsley) in a medium bowl; mix well. Add the onion mixture to the egg mixture; whisk to combine. Working quickly, spoon the mixture into the prepared muffin cups, filling each about 3/4 full (about 1 1/2 tablespoons). Every so often, give the mixture a stir to ensure the ingredients are staying evenly suspended in the custard.

  4. Bake, rotating the pans front to back and side to side halfway, until a knife inserted into the center comes out completely clean, 15 to 20 minutes. Immediately invert the muffin tins to transfer the mini quiches onto a baking sheet. Let cool on the sheet pan to room temperature, about 15 minutes.

To make ahead

Refrigerate caramelized onions (Step 1) for up to 3 days or freeze for up to 3 months. Refrigerate quiches for up to 3 days. Or freeze uncovered in a single layer on a parchment-lined sheet pan until solid, then transfer to a freezer bag for up to 2 months.


Two 24-cup nonstick mini muffin tins


For the best flavor, toast nuts before using in a recipe. To toast chopped nuts, place in a small dry skillet and cook over medium-low heat, stirring constantly, until fragrant, 2 to 4 minutes.

Nutrition Facts (per serving)

41 Calories
3g Fat
1g Carbs
2g Protein
Nutrition Facts
Servings Per Recipe 36
Serving Size 1 mini quiche
Calories 41
% Daily Value *
Total Carbohydrate 1g 0%
Protein 2g 4%
Total Fat 3g 4%
Saturated Fat 2g 10%
Cholesterol 32mg 11%
Vitamin A 110IU 2%
Vitamin C 1mg 1%
Vitamin D 7IU 2%
Folate 6mcg 2%
Sodium 88mg 4%
Calcium 38mg 3%
Magnesium 3mg 1%
Potassium 24mg 1%

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

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