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Caramelized Onion Butternut Squash Tart

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Sweet caramelized onions, roasted butternut squash, and creamy cheese layered over golden puff pastry—this tart is a savory showstopper for fall and winter meals.

  • Author: Ella
  • Prep Time: 20 minutes
  • Cook Time: 55 minutes
  • Total Time: 1 hour 15 minutes
  • Yield: 6 slices
  • Category: Appetizer, Main Course, Side Dish
  • Method: Roasting, Sautéing, Baking
  • Cuisine: American, European
  • Diet: Vegetarian

Ingredients

Main Ingredients

1 medium butternut squash, peeled, seeded, and cubed (about 4 cups)

2 large yellow onions, thinly sliced

1 sheet puff pastry, thawed (or shortcrust pastry)

2 tablespoons olive oil, divided

1 tablespoon unsalted butter

4 ounces goat cheese, feta, or gruyère (crumbled or shredded)

1 teaspoon fresh thyme or ½ teaspoon dried

Salt and freshly ground black pepper, to taste

1 egg, beaten (for egg wash)

Optional

Balsamic glaze or honey, for drizzling

Instructions

Prep the Squash

Preheat oven to 400°F (200°C).

Peel, seed, and cube the butternut squash into ½-inch pieces.

Toss squash with 1 tablespoon olive oil, thyme, salt, and pepper.

Spread on a baking sheet and roast for 20–25 minutes, flipping halfway, until tender and lightly browned.

Caramelize the Onions

While squash roasts, heat remaining 1 tablespoon olive oil and butter in a skillet over medium-low heat.

Add sliced onions and a pinch of salt.

Cook for 30–40 minutes, stirring occasionally, until deep golden and sweet.

Deglaze with a splash of water, wine, or vinegar if needed.

Assemble the Tart

Reduce oven temperature to 375°F (190°C).

Roll out puff pastry on a parchment-lined baking sheet.

Spread caramelized onions over the pastry, leaving a 1-inch border.

Layer roasted squash evenly over the onions.

Sprinkle with cheese of your choice.

Fold pastry edges slightly inward.

Brush crust with beaten egg.

Bake

Bake for 25–30 minutes, until pastry is puffed and golden brown.

Serve

Allow to cool slightly before slicing.

Drizzle with balsamic glaze or honey if desired.

Serve warm or at room temperature.

Notes

Gruyère adds a savory, melty richness; goat cheese adds tang; feta adds saltiness.

For extra crisp pastry, chill assembled tart for 10 minutes before baking.

Add-ins like sautéed mushrooms, spinach, or roasted garlic work beautifully.

Leftovers reheat well in the oven or air fryer.