Caramelized Onion Butternut Squash Tart

Why You’ll Love This Recipe

This tart is bursting with rich, comforting flavors that taste like autumn on a plate. The caramelized onions provide a sweet, jammy base, while the roasted butternut squash brings warmth and texture. It’s visually stunning and incredibly versatile—great for vegetarians, and easy to adapt with different cheeses or crusts. It’s also make-ahead friendly and tastes just as good warm as it does at room temperature.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• Butternut squash (peeled, cubed, and roasted)
• Yellow onions (thinly sliced)
• Olive oil or butter (for caramelizing)
• Puff pastry or pie crust (store-bought or homemade)
• Fresh thyme or rosemary (optional)
• Salt and pepper (to taste)
• Egg (for egg wash, optional)
• Cheese (goat cheese, feta, or Gruyère – optional)

Directions

1. Preheat your oven to 400°F (200°C).
2. Toss cubed butternut squash with olive oil, salt, and pepper. Roast on a baking sheet for 25–30 minutes, or until tender and golden.
3. In a large skillet, heat oil or butter over medium-low heat. Add sliced onions and cook slowly, stirring often, for 30–40 minutes until deep golden brown and caramelized.
4. Roll out your puff pastry or pie crust and place it on a baking sheet or in a tart pan.
5. Spread the caramelized onions evenly over the crust, leaving a small border if using puff pastry.
6. Layer the roasted butternut squash over the onions, and sprinkle with herbs and cheese if using.
7. Fold edges in slightly (for puff pastry) and brush with egg wash if desired.
8. Bake for 20–25 minutes, or until the crust is golden and the toppings are lightly browned.
9. Let cool slightly before slicing and serving.

Servings and timing

This recipe serves 6–8 people.
Prep time: 20 minutes
Cook time: 60–70 minutes
Total time: 1 hour 30 minutes

Variations

• Use sweet potato instead of butternut squash for a similar flavor with a twist.
• Add a layer of ricotta or cream cheese under the onions for creaminess.
• Swap fresh herbs for dried if that’s what you have on hand.
• Use a gluten-free crust to accommodate dietary needs.
• Add a handful of arugula on top after baking for a fresh, peppery bite.

Storage/Reheating

Store leftovers in an airtight container in the refrigerator for up to 3 days.
Reheat in the oven at 350°F until warmed through, about 10–15 minutes. Avoid microwaving if possible to preserve the tart’s crispness. The tart can also be served cold or at room temperature.

FAQs

Can I make this tart ahead of time?

Yes, you can prepare the tart a day in advance. Store it in the fridge and reheat in the oven before serving.

Do I need to peel the butternut squash?

Yes, peeling is recommended to ensure a smooth texture and better presentation in the tart.

Can I use store-bought caramelized onions?

You can, but homemade caramelized onions will give the best flavor and texture.

What cheese works best?

Goat cheese, feta, or Gruyère all complement the sweet and savory flavors beautifully.

Can I freeze the tart?

It’s best fresh, but you can freeze it after baking. Reheat in the oven directly from frozen for best results.

Is puff pastry or pie crust better?

Both work well. Puff pastry gives a flakier texture, while pie crust offers a sturdier base.

What can I serve with this tart?

It pairs nicely with a green salad, soup, or roasted vegetables.

Can I make it vegan?

Yes, use a vegan crust, skip the cheese or use plant-based alternatives, and caramelize onions in oil.

How do I prevent the crust from getting soggy?

Ensure the onions and squash aren’t too wet before layering. You can also pre-bake the crust for 5–10 minutes.

Can I use frozen butternut squash?

Yes, thaw and roast it as directed, but pat dry to remove excess moisture.

Conclusion

Caramelized Onion Butternut Squash Tart is a comforting, flavorful dish that celebrates seasonal ingredients in a delicious way. With its sweet-savory balance, golden crust, and flexible ingredients, it’s a standout option for everything from weeknight dinners to festive holiday tables. Try it once, and it just might become a new favorite.

Caramelized Onion Butternut Squash Tart

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Caramelized Onion Butternut Squash Tart is a savory, autumn-inspired dish made with roasted butternut squash, sweet caramelized onions, and herbs layered over a flaky crust. It’s perfect for gatherings, brunch, or a cozy dinner.

• Author: Laura
• Prep Time: 20 minutes
• Cook Time: 70 minutes
• Total Time: 1 hour 30 minutes
• Yield: 6–8 servings
• Category: Main Course
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

• 1 medium butternut squash, peeled and cubed
• 2 large yellow onions, thinly sliced
• 2 tbsp olive oil or butter (plus more for roasting)
• 1 sheet puff pastry or 1 pie crust (store-bought or homemade)
• 1 tsp fresh thyme or rosemary (optional)
• Salt and pepper to taste
• 1 egg (for egg wash, optional)
• 1/2 cup goat cheese, feta, or Gruyère (optional)

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Instructions

1. Preheat oven to 400°F (200°C).
2. Toss cubed butternut squash with olive oil, salt, and pepper. Spread on a baking sheet and roast for 25–30 minutes until tender and golden. Set aside.
3. Meanwhile, heat 2 tbsp olive oil or butter in a large skillet over medium-low heat. Add sliced onions and cook, stirring often, for 30–40 minutes until deeply caramelized.
4. Roll out puff pastry or pie crust and place on a baking sheet or tart pan.
5. Spread caramelized onions evenly over the crust, leaving a 1-inch border if using puff pastry.
6. Top with roasted squash, sprinkle with herbs and cheese if using.
7. Fold the edges slightly inward and brush with egg wash if desired.
8. Bake for 20–25 minutes, or until the crust is golden and the topping is lightly browned.
9. Let cool slightly before slicing and serving warm or at room temperature.

Notes

• Ensure squash and onions aren’t too wet to prevent a soggy crust.
• To save time, caramelize onions and roast squash ahead of time.
• Use parchment paper to prevent sticking when baking.
• Fresh herbs elevate flavor, but dried herbs work in a pinch.
• Add a layer of ricotta or cream cheese under onions for extra richness.

Nutrition

• Serving Size: 1 slice
• Calories: 280
• Sugar: 5g
• Sodium: 320mg
• Fat: 17g
• Saturated Fat: 7g
• Unsaturated Fat: 8g
• Trans Fat: 0g
• Carbohydrates: 28g
• Fiber: 3g
• Protein: 6g
• Cholesterol: 40mg