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Winter Squash Frittata

This winter squash frittata is a vibrant, high-protein dish that brings a touch of luxury to a midweek meal or weekend brunch. The combination of sweet roasted squash, earthy kale, and fragrant saffron creates a sophisticated flavour profile that is beautifully balanced by aromatic tarragon. Finished with a rich, handmade garlic aioli, it is a satisfying way to enjoy seasonal produce during the cooler months.

Ideal for those seeking a nutritious and filling vegetarian option, this recipe works equally well served warm from the frying pan or at room temperature for a healthy lunch. Using delicata or butternut squash provides a lovely creamy texture that contrasts with the leafy kale. Pair it with a crisp green salad for a simple yet elegant meal that feels truly restorative.

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Ingredients for Winter Squash Frittata

  • 120ml vegetable oil

  • 60ml extra-virgin olive oil

  • 1 large egg yolk

  • 1 garlic clove, finely grated

  • 1 teaspoon fresh lemon juice

  • Kosher salt

  • 2 small delicata or 1 small butternut squash (about 675g .)

  • 2 tablespoons plus 60ml extra-virgin olive oil

  • 1 teaspoon crumbled saffron threads

  • 12 large eggs

  • 1/4 cup tarragon leaves, chopped

  • 1 medium onion, thinly sliced

  • 2 cups coarsely torn kale leaves

  • 2 teaspoons kosher salt

Combine both oils in a measuring glass. Whisk egg yolk and garlic in a small bowl. Whisk in 1 teaspoon water, then, whisking constantly, add oils, drop by drop at first (do not add too quickly). Whisk until oil is incorporated and aioli holds its shape. Stir in lemon juice; season with salt.

Preheat oven to 149°C. Cut squash in half lengthwise; scoop out seeds (peel if using butternut). Slice crosswise 1/4" thick. Toss squash with 2 tablespoons oil on a parchment-lined baking sheet and arrange in a single layer. Bake until tender (don’t let them take on any colour), 18–20 minutes. Remove from oven; leave oven on.

Meanwhile, combine saffron and 1 tablespoon hot water in a small bowl. Let sit 1 minute. Whisk saffron and soaking liquid, eggs, and tarragon in a large bowl.

Heat remaining 60ml oil in an ovenproof 10" nonstick skillet over medium. Cook onion, stirring occasionally, until softened (don’t let them take on any colour), 10–12 minutes. Add kale and cook, stirring, until beginning to wilt, about 5 minutes. Add reserved squash and toss.

Whisk salt into egg mixture; pour into skillet. Cook, stirring often with a rubber spatula and occasionally pushing away from skillet sides to shape and compress, until beginning to set and turn golden brown on the bottom, about 5 minutes. Press down on frittata to flatten. Transfer to oven; bake 20 minutes. Slide frittata onto a platter and serve with aioli.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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