Golden, flaky, and glowing with warmth, this Caramelized Onion Butternut Squash Tart is everything you want in a comforting seasonal bake. The buttery crust cradles deeply sweet onions, tender roasted squash, and creamy, tangy goat cheese. It’s herb-kissed, rich in texture, and a beautiful centerpiece for brunches, fall dinners, or cozy gatherings.

This tart is the kind of savory treat that bridges rustic flavors with a refined finish. Whether you’re serving vegetarians or meat lovers, it has a universally satisfying appeal thanks to the blend of caramelized edges, creamy crumbles, and that irresistible golden topping.

Why You’ll Love This Caramelized Onion Butternut Squash Tart

Flavor Complexity: Sweet, savory, tangy, and herbaceous all in one bite.
Crowd Pleaser: Perfect for sharing at holiday tables, brunches, or potlucks.
Make-Ahead Friendly: Prep the filling ahead and bake when needed.
Vegetarian Delight: A satisfying meatless option that doesn’t sacrifice flavor.

What Kind of Pastry Should I Use?

A classic shortcrust pastry is ideal here—sturdy enough to hold the hearty filling, yet tender and flaky for that perfect bite. You can go homemade or store-bought. Just make sure to blind bake it before adding the filling so the crust stays crisp and doesn’t get soggy from the caramelized onions.

Ingredients for the Caramelized Onion Butternut Squash Tart

Butternut Squash: This autumn staple adds sweetness and body to the tart. When roasted, it brings soft texture and caramelized depth.

Red Onions: Slowly cooked until golden and jammy, they become the star savory-sweet component of the tart.

Goat Cheese: Crumbly and creamy, this cheese adds a tang that cuts through the richness beautifully.

Fresh Thyme: Adds a fragrant herbaceous note that enhances both squash and onion.

Olive Oil: For roasting and caramelizing, it lends smooth, fruity undertones.

Salt and Pepper: The essential seasonings to elevate every bite.

Shortcrust Pastry: Acts as the buttery, flaky base that ties everything together.

Eggs & Heavy Cream: Create the custard base that binds the tart and brings richness.

How To Make the Caramelized Onion Butternut Squash Tart

Step 1: Roast the Butternut Squash

Peel and cube 2 cups of butternut squash. Toss with 1 tablespoon olive oil, salt, and pepper. Roast at 400°F (200°C) for 25 minutes until tender and slightly golden. Let cool.

Step 2: Caramelize the Onions

Slice 2 large red onions. In a pan over medium-low heat, add 1 tablespoon olive oil and cook onions with a pinch of salt for 25-30 minutes, stirring occasionally, until deeply caramelized.

Preheat oven to 375°F (190°C). Roll out your shortcrust pastry and fit into a 9-inch tart pan. Prick with a fork, line with parchment and baking beans. Bake for 15 minutes. Remove weights and bake for 5 more minutes until lightly golden.

Step 4: Prepare the Custard

In a bowl, whisk 3 eggs and 1/2 cup heavy cream. Season lightly with salt and pepper.

Step 5: Assemble the Tart

Layer the caramelized onions and roasted squash evenly in the crust. Pour over the egg mixture. Dot with 1/2 cup goat cheese and sprinkle 1 teaspoon fresh thyme.

Step 6: Bake and Serve

Bake the tart at 375°F (190°C) for 30-35 minutes or until the custard is set and the top is golden. Let it cool slightly before slicing.

How to Serve the Caramelized Onion Butternut Squash Tart

This tart feeds 6 people generously as a main or up to 8 as a side. Serve warm with a crisp green salad or a simple soup for a full meal. For brunches, it pairs perfectly with poached eggs or mimosas.

How to Store This Tart

Let the tart cool completely before storing. Wrap tightly or store in an airtight container in the fridge for up to 4 days. To reheat, place slices in a 350°F oven for about 10 minutes. You can also freeze the baked tart for up to 1 month—wrap well and thaw overnight in the fridge before reheating.

Frequently Asked Questions

Can I use store-bought pie crust instead of shortcrust pastry?
Yes, a store-bought crust works just fine, though homemade offers a flakier bite.

What can I substitute for goat cheese?
Feta cheese is a great substitute if you want a saltier bite, or ricotta for something creamier and milder.

Can I make this tart dairy-free?
Yes, use a dairy-free cream alternative and skip the cheese or use a plant-based version.

How can I make this tart gluten-free?
Simply use a gluten-free tart crust or press in a crust made of almond flour and butter.

Is this tart good served cold?
Absolutely! It’s delicious at room temperature or chilled, making it great for picnics or packed lunches.

Want More Tart Ideas with a Twist?

If this Caramelized Onion Butternut Squash Tart hits the spot, you’ll love these too:

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📌 Save this recipe to your Pinterest board so you can revisit it whenever cozy season cravings hit: Mad For Meals on Pinterest.

Let me know how yours turned out. Did you use thyme or experiment with rosemary? Try blue cheese for a twist? I love hearing how you make these recipes your own. Leave a comment and share!

Caramelized Onion Butternut Squash Tart

Author: Mia McKenny
Total Time: 85 minutes
Yield: 1 tart (serves 6)
Diet: Vegetarian

Print Recipe

Description

Golden, flaky, and glowing with warmth, this Caramelized Onion Butternut Squash Tart is a savory tart recipe that’s perfect for easy dinner, holiday sides, brunch ideas, or healthy snack options. Featuring slow-cooked red onions, roasted butternut squash, and creamy goat cheese, it’s layered with deep flavor in every bite. Ideal for meal prep or gatherings, this easy recipe is a must-try comfort food idea.

Instructions

1. Preheat the oven to 400°F (200°C).

2. Toss 2 cups of cubed butternut squash with 1 tablespoon olive oil, a pinch of salt and pepper. Roast for 25 minutes until tender and caramelized. Let cool.

3. In a skillet, heat 1 tablespoon olive oil over medium-low heat. Add 2 sliced red onions and a pinch of salt. Cook slowly, stirring occasionally, for 25–30 minutes until golden and jammy.

4. Lower oven temperature to 375°F (190°C). Roll out shortcrust pastry into a 9-inch tart pan. Prick the bottom, line with parchment and baking weights, and blind bake for 15 minutes. Remove weights and bake 5 minutes more.

5. In a bowl, whisk together 3 eggs, 1/2 cup heavy cream, 1/2 teaspoon salt, and 1/4 teaspoon pepper.

6. Layer roasted squash and caramelized onions into baked crust. Pour custard over. Dot with 1/2 cup crumbled goat cheese and sprinkle with 1 teaspoon fresh thyme.

7. Bake for 30–35 minutes until custard is set and top is golden. Let cool 10 minutes before slicing.

Notes

Roast the squash and caramelize onions ahead for quicker assembly.

Let the tart cool before slicing for cleaner cuts.

Fresh thyme can be swapped with rosemary for a different herb profile.

Prep Time: 20 minutes
Cook Time: 65 minutes
Category: Dinner, Brunch, Vegetarian
Method: Baking
Cuisine: American, Seasonal

Nutrition

Serving Size: 1 slice (1/6 of tart)
Calories: 320
Sugar: 7g
Sodium: 380mg
Fat: 22g
Saturated Fat: 9g
Unsaturated Fat: 11g
Trans Fat: 0g
Carbohydrates: 22g
Fiber: 3g
Protein: 8g
Cholesterol: 135mg

Keywords: savory tart, squash tart, brunch ideas, easy dinner, holiday side