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Caramelized Onion and Roasted Mushroom Flatbread Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 3.9 from 75 reviews
  • Author: Elina
  • Prep Time: 1 hour 15 minutes
  • Cook Time: 10 minutes
  • Total Time: 1 hour 25 minutes
  • Yield: 4 servings 1x
  • Category: Main Course
  • Method: Baking
  • Cuisine: American
  • Diet: Vegan

Description

This Caramelized Onion and Roasted Mushroom Flatbread recipe offers a deliciously savory and comforting meal featuring slowly caramelized onions, perfectly roasted mushrooms, and a creamy vegan cashew sauce layered on crispy flatbread. The slow cooking of onions imparts deep sweetness, while the thyme and garlic-seasoned mushrooms add an earthy flavor. Topped with fresh parsley, this flatbread is ideal for a satisfying vegan lunch or dinner.


Ingredients

Scale

For Caramelized Onions

  • 3 Tablespoons olive oil, divided
  • 1 large yellow onion, thinly sliced
  • Pinch of salt

For Roasted Mushrooms

  • 2 cloves garlic, chopped
  • 1 teaspoon dried thyme
  • ½ teaspoon salt
  • Pinch of ground pepper
  • 2 cups sliced mushrooms
  • 1 tablespoon olive oil

For Assembly

  • Flatbread crust (such as naan bread or other flatbread of choice)
  • 1 cup Vegan Cashew Cream Sauce
  • About ¼ cup chopped parsley for garnish

Instructions

  1. Caramelize the Onions: Heat 2 tablespoons of olive oil in a frying pan over low heat. Add the thinly sliced onion with a pinch of salt. Cook slowly on low for 1 hour and 15 minutes, stirring occasionally, until the onions are soft and golden brown but not burnt. This slow process brings out the natural sweetness and deep flavor.
  2. Preheat Oven and Prepare Mushrooms: While the onions cook, preheat the oven to 400°F (204°C). In a medium mixing bowl, combine 1 tablespoon of olive oil, chopped garlic, dried thyme, ½ teaspoon salt, and a pinch of ground pepper. Toss in the sliced mushrooms until evenly coated with the seasoning.
  3. Roast the Mushrooms: Spread the seasoned mushrooms in a single layer on a parchment-lined baking sheet. Bake for 15 minutes, then stir and bake for an additional 5 minutes. Remove from oven and set aside to cool slightly.
  4. Prepare Cashew Cream Sauce: If you haven’t already prepared your vegan cashew cream sauce, blend the ingredients now while the onions and mushrooms finish cooking. This creamy sauce provides richness and balances the earthiness of the mushrooms.
  5. Assemble Flatbreads: Once onions are caramelized and mushrooms roasted, increase oven temperature to 425°F (218°C). Place flatbread crusts on the oven rack. Spread each flatbread evenly with 3 to 4 heaping tablespoons of vegan cashew cream sauce, creating a thick layer to ensure it melts into the crust during baking.
  6. Add Toppings and Bake: Evenly distribute roasted mushrooms and caramelized onions over the sauce layers. Place flatbreads directly on the oven rack and bake for 10 minutes or until the crust is crisp on the bottom and toppings are heated through.
  7. Garnish and Serve: Remove flatbreads from oven, sprinkle generously with chopped parsley for a fresh, vibrant finish. Serve immediately while hot for best texture and flavor.

Notes

  • Caramelizing onions requires patience and low heat to avoid burning; stirring occasionally is key.
  • You can substitute any flatbread of your choice, such as naan, pita, or pizza crusts.
  • For a gluten-free option, use a gluten-free flatbread.
  • The vegan cashew cream sauce can be prepared ahead of time and refrigerated.
  • Adjust the thickness of the cashew cream sauce layer to your liking; a thicker layer prevents the crust from drying out.
  • Fresh thyme can be used instead of dried thyme for more fragrant flavor.