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5 from 11 votes

Butternut Squash Quiche with Caramelized Onions

This vegetarian butternut squash quiche is filled with caramelized onions and goat cheese, is easy to make ahead of time, and is perfect for brunch!
Prep Time15 minutes
Cook Time1 hour 20 minutes
Cooling Time1 hour
Total Time2 hours 35 minutes
Course: Breakfast
Cuisine: French
Diet: Vegetarian
Servings: 8 people
Calories: 257kcal

Ingredients

  • 2 tablespoons olive oil, divided
  • 2 teaspoons salt, divided
  • 2 onions, thinly sliced
  • 1 cup butternut squash, peeled + diced About ⅓ of a medium-sized squash
  • 1 teaspoon red chili flakes
  • ½ teaspoon smoked paprika
  • 1 9" pie dough (prepared)
  • 4 ounces goat cheese, flaked apart with a fork
  • 4 eggs, divided
  • cup milk
  • cup heavy whipping cream
  • 1 sprig rosemary, destemmed + cut into small pieces

Instructions

  • Preheat oven to 400ºF.

Caramelize Onions:

  • Add half the olive oil to a large, heavy pot, and heat over medium heat.  Add onions and half the salt.  Cook about 5 minutes, and then lower heat to medium-low.  Stir occasionally until onions turn golden brown.
    Tip: Make sure the onions are dark and golden.  If they aren't fully caramelized, they'll have extra moisture that you don't want in your quiche.

Roast Butternut Squash:

  • Lay diced squash in a single layer on a baking sheet.  Drizzle with the remaining olive oil.  Sprinkle with chili flakes, paprika, and remaining salt.  Roast about 20 minutes until tender.

Blind Bake Pie Dough:

  • Lower oven temperature to 350ºF.
  • Arrange pie dough inside a pie pan.  Prick the bottom and sides with a fork.  Set parchment paper on top of dough, and add pie weights or dry beans.  Bake 10 minutes.  Remove weights and parchment paper.
    Tip: Pre-made, pre-formed, frozen pie dough will not need pie weights added while blind baking.

Make the Quiche:

  • Gently press the onions and half the cheese into the pie dough.  Add the butternut squash.
  • Add 3 eggs, milk, cream, and rosemary to a mixing bowl.  Use an electric hand mixer to whip the mixture until it doubles in size.  (Alternatively, whisk vigorously by hand.)
  • Add the remaining cheese to the egg and milk mixture, and gently stir with a spoon.  Take care not to over-stir. 
  • Pour the egg mixture into the pie pan.  
    Tip: Do not overfill the quiche-- any extra mixture can be discarded, saved for another quiche, or used to dip bread in for French toast.
  • Beat remaining egg, and brush onto any exposed pie dough.
  • Tent quiche loosely with aluminum foil.  Bake 45 minutes.  Remove foil, and bake 15-20 more minutes until the quiche is golden and set.  Quiche should jiggle slightly when moved.
  • Allow quiche to cool for at least 1 hour, or refrigerate overnight.  (Quiche will not be fully set until cooled.)
  • Serve cool within 2-3 days, or check recipe notes for freezer directions.

Notes

For Deep Dish Pie Pan:  Add 1 extra egg and ½ cup milk or cream.
Make Ahead: 
  • Freeze: Bake quiche, and allow to cool completely.  Wrap tightly with plastic wrap, and slide into a freezer bag.  Use within 2 months.
  • Reheat from Frozen: Do not thaw.  Bake at 350ºF for 20-25 minutes, or until pie is warm.
  • Tip: If freezing, bake quiche in either a disposable aluminum pie pan or in a tart pan with removable sides.  (Allow quiche to fully cool before removing the pan.)
Nutrition information includes ¼ of the egg used for the egg wash, since most of the egg is discarded.

Nutrition

Calories: 257kcal | Carbohydrates: 16g | Protein: 7g | Fat: 18g | Saturated Fat: 7g | Cholesterol: 88mg | Sodium: 764mg | Potassium: 186mg | Fiber: 1g | Sugar: 2g | Vitamin A: 2420IU | Vitamin C: 5.7mg | Calcium: 78mg | Iron: 1.4mg