Name: Butternut Squash & Mushroom Puff Pastry Tart Recipe
Prep time: 30 min
Cook time: 40 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 1 lb homemade rough puff pastry or store-bought frozen & thawed puff pastry (2 sheets); 1 large egg beaten with 1 Tablespoon (15ml) water or milk; 1 Tablespoon (15ml) olive oil; 2 cups (about 270g) peeled & sliced butternut squash (1/4 inch slices); 1 and 1/4 cups (150g) sliced or roughly chopped mushrooms; 1/2 cup sliced onion (1/2 of a medium onion); 3 garlic cloves, minced; 1/4 teaspoon salt; Pinch freshly ground black pepper, plus more for garnish; 2 teaspoons fresh thyme leaves (or 1 teaspoon dried); 2 teaspoons chopped fresh rosemary (or 1 teaspoon dried); Pinch ground nutmeg; 1 cup (120g) shredded parmesan cheese; Optional for garnish: flaky sea salt, pepper, more cheese, more fresh thyme & rosemary

Jump to Recipe· 4.1 from 69 reviews

If you're looking to impress your friends or simply treat yourself to a cozy, flavorful meal, this Butternut Squash & Mushroom Puff Pastry Tart Recipe is an absolute must-try. Imagine a golden, flaky puff pastry base piled high with tender, sweet butternut squash and earthy mushrooms, all enhanced by aromatic herbs and a generous sprinkle of parmesan cheese. This dish combines simplicity with elegance, making it perfect for everything from a casual family dinner to a festive gathering. Once you take a bite, you’ll understand why this tart has quickly become one of my all-time favorites.

Ingredients You'll Need

The image shows two side-by-side close-up views on a white marbled surface. On the left, a clear glass bowl filled with bright orange sliced pieces of squash sits centered, with a larger chunk of the same orange squash placed outside the top of the bowl on the surface. On the right, there is a small pile of sliced white onions layered to the left, a bunch of mixed brown and white sliced mushrooms in the middle, and sprigs of fresh green herbs including rosemary and thyme positioned diagonally around the ingredients. Two cloves of garlic lie near the bottom right corner. The image captures fresh, raw ingredients with clear textures and colors, photo taken with an iphone --ar 4:5 --v 7

Don't let the list intimidate you. Each ingredient in this Butternut Squash & Mushroom Puff Pastry Tart Recipe plays a crucial role in crafting those irresistible layers of flavor and texture that keep you coming back for more. From the buttery puff pastry to the fragrant rosemary, every element contributes to a harmonious, mouthwatering tart.

1 lb puff pastry (homemade or store-bought): The golden, flaky foundation for our tart.

Egg wash (1 large egg + 1 Tablespoon water or milk): Helps achieve that shiny, beautiful crust.
1 Tablespoon olive oil: For cooking the veggies and adding a subtle richness.
2 cups sliced butternut squash: Sweet and tender, the star of the vegetable topping.

1 ¼ cups mushrooms: Adds earthiness and depth to the flavor profile.
½ cup sliced onion: Brings subtle sweetness and a gentle bite.
3 garlic cloves, minced: Aromatic punch that brightens the whole tart.

¼ teaspoon salt: Enhances all the natural flavors.
Pinch of freshly ground black pepper: Adds a hint of warmth and spice.
2 teaspoons fresh thyme leaves (or 1 teaspoon dried): Herby freshness that complements the squash perfectly.
2 teaspoons chopped rosemary (or 1 teaspoon dried): Provides a piney, fragrant note to balance the dish.

Pinch ground nutmeg: Just a touch to elevate the butternut squash’s sweetness.
1 cup shredded parmesan cheese: A nutty, salty finish that melts beautifully.
Optional garnishes (flaky sea salt, extra cheese, fresh herbs): For that final flourish when serving.

How to Make Butternut Squash & Mushroom Puff Pastry Tart Recipe

Step 1: Prepare Your Dough

If you’re feeling adventurous, homemade rough puff pastry is a rewarding way to go, but store-bought puff pastry works just as well and saves time. Either way, keep the dough chilled until you’re ready to roll, which helps keep that crisp, buttery texture we’re all looking for in the finished tart.

Step 2: Cook the Vegetables

In a large skillet set over low-medium heat, warm the olive oil and gently sauté the butternut squash for about 5 minutes. Add your mushrooms, onion, minced garlic, salt, pepper, thyme, rosemary, and nutmeg, then cook everything until tender and fragrant—about 5 to 6 more minutes. This softens the veggies while locking in their natural sweetness and savory notes, forming a perfect base for the tart.

Step 3: Roll Out the Puff Pastry

Lightly flour your workspace and rolling pin, then roll your puff pastry into a 10×16-inch rectangle. If using store-bought sheets, layer them and press together carefully before rolling for the perfect size. Transfer the dough to a parchment-lined baking sheet, reshape if needed, and create a ½ inch folded edge around the tart’s perimeter. Crimp the edges with a fork to seal everything in—this helps those edges rise gorgeously while keeping the toppings inside. If the dough feels warm or soft, pop it back into the fridge for 10 minutes to firm up.

Step 4: Assemble the Tart

Brush the entire surface of the puff pastry, including the edges, with the egg wash to ensure a golden, glossy finish. Use a fork to poke tiny holes all over the inside of the dough to prevent puffing up too much during baking. Sprinkle about three-quarters of your parmesan cheese evenly over the base, then spoon the cooked vegetable mixture on top and spread it out gently into a single layer.

Step 5: Baking Time

Bake your tart at 400°F (204°C) for 30 minutes until the crust is puffed and starting to turn golden. Remove the tart from the oven, scatter the remaining parmesan on top, and pop it back in for another 5 to 8 minutes. The cheese melts into little crispy pockets of deliciousness while the crust deepens to that perfect golden brown.

Step 6: Final Touches

Once it’s out of the oven, sprinkle flaky sea salt, freshly cracked black pepper, and a handful of your favorite fresh herbs if you like. Let it cool just slightly before slicing so the filling stays put. Serve warm or at room temperature for an effortlessly elegant dish.

How to Serve Butternut Squash & Mushroom Puff Pastry Tart Recipe

The image shows a close-up of two slices of pizza stacked on top of each other. The pizza has a thick, puffy crust with a golden-brown color and a flaky, layered texture. The top layer of the pizza is covered with bright orange roasted slices, possibly sweet potatoes or squash, and small bits of browned cheese that add a slightly melted texture. There are scattered dark caramelized spots and small green herbs like rosemary sprinkled on the pizza, adding color contrast. The surface under the pizza is a white marbled texture. The photo taken with an iphone --ar 4:5 --v 7

Garnishes

To really elevate your tart, try garnishing with a sprinkle of flaky sea salt and extra fresh thyme or rosemary leaves. A light dusting of black pepper or an additional handful of freshly grated parmesan adds a burst of salty richness and lovely aroma right before serving.

Side Dishes

This tart shines as a centerpiece but pairs beautifully with crisp mixed greens dressed lightly with lemon vinaigrette, or a warm bowl of creamy soup on the side. Roasted root vegetables or a simple arugula salad with toasted nuts will also add texture and a fresh balance to your meal.

Creative Ways to Present

Feel like switching things up? Cut the tart into bite-sized squares for a delightful appetizer at your next party. You can also serve individual smaller tarts using puff pastry circles in muffin tins for an elegant finger-food twist that will have guests raving.

Make Ahead and Storage

Storing Leftovers

Store any leftover tart in an airtight container in the refrigerator for up to 3 days. The flavors deepen overnight, making it just as tasty, if not better, the next day. Just be sure to keep it covered to prevent the pastry from drying out.

Freezing

You can freeze leftover tart by wrapping tightly in plastic wrap and then aluminum foil to prevent freezer burn. When frozen properly, it will keep for up to 1 month. Thaw it in the refrigerator overnight before reheating.

Reheating

For best results, reheat your tart in the oven at 350°F (175°C) for about 10-15 minutes until warmed through and the crust regains some of its original crispness. Avoid microwaving as it tends to make the pastry soggy.

FAQs

Can I use other types of squash in this recipe?

Absolutely! While butternut squash provides a lovely balance of sweetness and texture, you can swap in delicata, acorn, or kabocha squash. Just adjust the cooking time slightly based on their firmness.

Is this tart vegetarian or vegan?

This Butternut Squash & Mushroom Puff Pastry Tart Recipe is naturally vegetarian, but not vegan because of the egg wash and parmesan cheese. You can make it vegan by using vegan puff pastry, a plant-based egg wash substitute, and vegan cheese alternatives.

Can I prepare the topping ahead of time?

Yes! The vegetable topping can be cooked a day in advance and stored in the fridge. Just warm it slightly before assembling the tart to ensure everything bakes evenly.

What if I don’t have fresh herbs?

Dried herbs work perfectly here as well—just use about half the quantity since dried herbs are more concentrated. They still impart lovely flavor to your tart.

How do I prevent the puff pastry from becoming soggy?

Poking holes in the pastry base before adding toppings helps prevent it from puffing unevenly, while cooking the filling until tender ensures less moisture seeps into the dough. Baking on a parchment-lined sheet and chilling the dough before baking also helps maintain that flaky texture.

Final Thoughts

This Butternut Squash & Mushroom Puff Pastry Tart Recipe is one of those dishes that feels like a special occasion, yet is totally achievable on any weeknight. It has everything you could want from a fall-inspired meal—vegetable sweetness, herby layers, and flaky, buttery pastry that’s pure bliss. Give it a try soon, and I promise this will become a new staple in your recipe rotation, just as it has in mine.

Butternut Squash & Mushroom Puff Pastry Tart Recipe

Ingredients You'll Need