Golden, flaky, and irresistibly cheesy, this Mushroom and Onion Cheesy Pastry Tart is a savory delight that will have you coming back for more.
With a buttery homemade crust, rich caramelized onions, earthy mushrooms, and melty plant-based cheese, this tart is perfect for brunch, a light lunch, or an elegant appetizer.
Each bite is packed with deep umami flavors and a satisfying crispness from the pastry, making it a truly indulgent treat!
Ingredients
Here’s what you’ll need to make this Mushroom and Onion Cheesy Pastry Tart:
For the pastry crust:
- 1 1/4 cups all-purpose flour
- 1/2 teaspoon salt
- 1/2 cup vegan butter, chilled and cubed
- 3-4 tablespoons ice water
For the filling:
- 1 tablespoon olive oil
- 1 tablespoon vegan butter
- 1 large onion, thinly sliced
- 2 cloves garlic, minced
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1 teaspoon balsamic vinegar
- 8 oz mushrooms (cremini or button), sliced
- 1/2 teaspoon dried thyme (or 1 teaspoon fresh)
- 1 cup shredded vegan mozzarella or melty plant-based cheese
- 1/4 cup fresh parsley, chopped (for garnish)
Instructions
Follow these simple steps to make your Mushroom and Onion Cheesy Pastry Tart:
- Prepare the Dough:
In a mixing bowl, whisk together the flour and salt. Add the chilled vegan butter and use your hands or a pastry cutter to work it into the flour until the mixture resembles coarse crumbs. This ensures a flaky texture by keeping small pockets of butter throughout the dough. - Add the Water:
Drizzle in the ice water, 1 tablespoon at a time, mixing gently until the dough just comes together. Stop adding water as soon as it holds its shape when pressed—overworking the dough can result in a tough crust. - Chill the Dough:
Shape the dough into a disc, wrap it in plastic wrap, and refrigerate for at least 30 minutes. This resting period allows the gluten to relax and firms up the butter for a better texture. - Roll Out the Dough:
On a lightly floured surface, roll out the chilled dough to fit a 9×13-inch tart pan or baking dish. Press it into the pan, trim any excess, and prick the bottom with a fork to prevent air bubbles from forming during baking. - Prebake the Crust:
Preheat your oven to 375°F (190°C). Line the crust with parchment paper and fill it with pie weights or dried beans to keep it from puffing up. Bake for 10-12 minutes, then remove the weights and bake for another 5 minutes until lightly golden. Set aside to cool slightly. - Caramelize the Onions:
- Heat olive oil and vegan butter in a pan over medium heat.
- Add the sliced onions and cook, stirring occasionally, for 15-20 minutes until they become golden, soft, and slightly jammy.
- Stir in the garlic, salt, and black pepper, then deglaze with balsamic vinegar.
- Let it cook for another minute to enhance the depth of flavor before removing from heat.
- Sauté the Mushrooms:
In the same pan, add the mushrooms and thyme. Cook for 5-7 minutes, stirring occasionally, until they release their moisture and turn golden brown. Letting the mushrooms brown properly intensifies their umami flavor and prevents them from becoming soggy. - Layer the Tart:
Spread the caramelized onions evenly over the prebaked crust, ensuring every bite gets a sweet, savory layer. Sprinkle a generous amount of shredded vegan cheese, then arrange the sautéed mushrooms on top for the perfect balance of flavors. - Bake Until Golden:
Return the tart to the oven and bake for 15-18 minutes, or until the cheese is melted, bubbly, and slightly golden. The crust should be crisp and firm at the edges. - Garnish and Serve:
Remove from the oven and let it rest for a few minutes before slicing. Sprinkle with fresh parsley for a bright, herby contrast, then serve warm and enjoy.
Tweaks and Additions
Want to customize your Mushroom and Onion Cheesy Pastry Tart? Try these variations:
- Make it extra cheesy:
If you’re a cheese lover, add an extra 1/2 cup of vegan mozzarella or mix in some dairy-free ricotta for an ultra-creamy filling. This creates an irresistibly gooey texture that pairs beautifully with the caramelized onions. - Try different mushrooms:
Swap out cremini mushrooms for shiitake, oyster, or portobello mushrooms to create a deeper, more complex flavor. Shiitake mushrooms offer a meaty, smoky taste, while oyster mushrooms provide a delicate, slightly sweet note. - Add some greens:
Toss in a handful of fresh spinach or arugula before baking for a nutrient boost and a vibrant pop of color. These greens will slightly wilt in the oven, adding another layer of texture to the tart. - Boost the umami:
A drizzle of truffle oil just before serving will elevate the tart’s luxurious, earthy flavors. This small addition makes a big impact, creating a gourmet-quality dish. - Make it gluten-free:
For a gluten-free version, use a 1:1 gluten-free flour blend for the crust or opt for a store-bought gluten-free puff pastry. This ensures that everyone can enjoy this delicious tart, regardless of dietary needs. - Spice it up:
If you enjoy a bit of heat, sprinkle a pinch of red pepper flakes over the cheese layer before baking. This adds a subtle warmth that balances beautifully with the richness of the cheese and onions. - Try a different crust:
Short on time? Use a ready-made vegan puff pastry instead of making the dough from scratch. This shortcut results in an ultra-flaky, buttery crust with minimal effort, perfect for busy days or last-minute guests.
This Mushroom and Onion Cheesy Pastry Tart is a crowd-pleaser that’s as impressive as it is easy to make.
Whether you serve it as a main course or a side dish, this rich and satisfying tart is guaranteed to bring warmth and comfort to any meal. So grab your ingredients and enjoy every cheesy, buttery bite!
