Butternut Squash Caramelized Onion Tart

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This Butternut Squash Caramelized Onion Tart is a show-stopping savory dish that marries sweet, roasted squash with deeply golden caramelized onions nestled in a flaky tart shell. The creamy cheese filling pulls everything together with richness and a touch of tang, while fresh thyme brightens up each bite. It’s the kind of recipe that turns a regular evening into something special or makes for an impressive brunch centerpiece.

Whether you’re looking for a fall-inspired vegetarian main, a side dish to a roast, or a creative way to use winter squash, this tart delivers layers of comforting flavor and texture. Each slice offers a balance of creamy, crisp, savory, and sweet—it’s cozy, elegant, and deeply satisfying.

Why You’ll Love This Butternut Squash Caramelized Onion Tart

• Seasonal and comforting: Uses hearty fall ingredients like squash and onion.
• Make-ahead friendly: Great for prepping ahead for dinner parties or holidays.
• Versatile: Serves as a main, side, or appetizer.
• Flavor-packed: The sweetness of caramelized onions meets creamy cheese and savory herbs in perfect harmony.

What Kind of Pastry Should I Use?

For this tart, a classic shortcrust pastry works beautifully—either homemade or store-bought. You want a crust that holds its shape when sliced but still offers a buttery flake. Blind baking the crust ensures a crisp bottom that doesn’t go soggy once filled. You could also use a puff pastry base if you want a more delicate texture with added lift.

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Ingredients for the Butternut Squash Caramelized Onion Tart

• Butternut Squash: The sweet, nutty flavor of roasted butternut squash forms the heart of the tart. It adds a creamy, soft bite that contrasts perfectly with the crisp crust.
• Yellow Onions: Slowly caramelized until deeply golden, they bring a jammy sweetness that enhances every bite.
• Olive Oil & Butter: A mix of both gives the onions their rich texture and flavor.
• Fresh Thyme: Earthy, slightly minty, and perfect for brightening up rich ingredients.
• Eggs: Helps set the filling into a custardy texture that binds the cheese and vegetables.
• Heavy Cream: Adds silkiness and body to the egg custard base.
• Goat Cheese: Brings tang and creaminess that pairs beautifully with the sweet squash and onions.
• Salt & Black Pepper: Essential for seasoning and depth.
• Tart Shell (9-inch): Your buttery base—either homemade or store-bought shortcrust pastry.

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How To Make the Butternut Squash Caramelized Onion Tart

Step 1: Roast the Butternut Squash

Preheat oven to 400°F (200°C). Peel and dice 2 cups worth of butternut squash into ½-inch cubes. Toss with a tablespoon of olive oil, a pinch of salt, and black pepper. Spread on a baking sheet and roast for 25-30 minutes until tender and lightly caramelized. Let cool.

Step 2: Caramelize the Onions

While the squash is roasting, thinly slice 2 large yellow onions. Heat 1 tablespoon olive oil and 1 tablespoon butter in a skillet over medium-low heat. Add the onions and cook slowly for 25-30 minutes, stirring often, until golden brown and sweet. Add 1 teaspoon chopped thyme in the final 5 minutes.

Step 3: Prepare the Tart Shell

Blind bake a 9-inch tart shell. If using a homemade shortcrust pastry, roll it out, fit into the tart pan, dock the base with a fork, line with parchment and fill with pie weights. Bake at 375°F (190°C) for 15 minutes, remove weights and bake another 5 minutes. Let cool slightly.

Step 4: Make the Filling

In a medium bowl, whisk together 3 large eggs, ½ cup heavy cream, ½ teaspoon salt, and ¼ teaspoon black pepper. Crumble in 4 oz goat cheese and mix lightly.

Step 5: Assemble the Tart

Scatter roasted squash evenly over the base of the tart. Top with caramelized onions, then pour in the egg mixture. Sprinkle extra thyme on top if desired.

Step 6: Bake and Serve

Reduce oven to 375°F (190°C) and bake tart for 30-35 minutes until set and golden. Let it cool for 10 minutes before slicing. Serve warm or at room temperature.

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How to Serve This Tart

This tart yields 8 slices, making it ideal for serving 4 to 6 people as a main dish or up to 8 as an appetizer or side. It pairs wonderfully with a crisp green salad, a bowl of soup, or even a light protein for a fuller meal.

Storing the Tart the Right Way

Leftovers can be refrigerated in an airtight container for up to 3 days. Reheat individual slices in a 350°F (175°C) oven for 10-12 minutes to revive the crisp crust and creamy filling. You can also freeze the whole tart (wrapped tightly) for up to 1 month. Thaw overnight in the fridge before reheating.

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Frequently Asked Questions

Can I use a different type of cheese?
Absolutely! While goat cheese adds a lovely tang, feta, ricotta, or cream cheese would also work well.

Can I make this tart ahead of time?
Yes, you can assemble and bake the tart a day in advance. Reheat before serving or enjoy at room temperature.

What if I don’t have fresh thyme?
You can substitute with ½ teaspoon of dried thyme or use rosemary or sage for a different herbaceous note.

Can I use store-bought crust?
Definitely! A high-quality store-bought tart or pie crust makes this recipe even faster without sacrificing flavor.

Is this tart gluten-free?
Not as written, but you can use a gluten-free tart crust to adapt it to your dietary needs.

Want More Savory Ideas?

If you love this cozy tart, try these other savory favorites from Mad For Meals:

• Rustic No-Knead Rosemary Garlic Bread for perfect pairing with soups.
• Creamy Garlic Shrimp Over Mashed Potatoes for a rich and elegant dinner.
• Autumn Harvest Chicken Skillet full of seasonal warmth.
• Roasted Beets and Carrots with Burrata Salad to serve on the side.

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Let me know in the comments how yours turned out. Did you go all in on goat cheese, or use a twist of feta? Did you prep it ahead or bake fresh? Love hearing all your variations!

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