Caramelized Onion Mushroom Flatbread

Featured in: Retro American Dishes

This flatbread features a crisp crust topped with golden caramelized onions and tender sautéed mushrooms. A blend of mozzarella and tangy goat cheese melts atop for rich, savory enjoyment. Fresh herbs add a bright finish, creating a dish perfect for sharing or a light meal. Baked until bubbly and golden, it pairs wonderfully with crisp white wine and optional additions like arugula or truffle oil.

Updated on Tue, 11 Nov 2025 10:45:00 GMT
Savory caramelized onion & mushroom flatbread garnished with fresh herbs and melted cheese.  Save It
Savory caramelized onion & mushroom flatbread garnished with fresh herbs and melted cheese. | zetluna.com

A savory flatbread topped with sweet caramelized onions, earthy mushrooms, melty cheese, and fresh herbs—perfect as an appetizer or light meal.

I first served this flatbread at a casual gathering and it was a huge hit with friends and family.

Ingredients

  • Dough: 1 pound (450 g) store-bought or homemade pizza dough
  • Toppings: 2 tablespoons olive oil, 2 large yellow onions thinly sliced, 2 teaspoons balsamic vinegar, 8 ounces (225 g) cremini or button mushrooms sliced, 2 cloves garlic minced, 1 teaspoon fresh thyme leaves (or ½ teaspoon dried), ½ teaspoon salt, ¼ teaspoon black pepper, 1 cup (100 g) shredded mozzarella cheese, ½ cup (50 g) crumbled goat cheese or feta, 2 tablespoons chopped fresh parsley (optional)

Instructions

Preheat oven:
Preheat the oven to 450°F (230°C). If using a pizza stone place it in the oven to heat.
Caramelize onions:
In a large skillet over medium heat add 1 tablespoon olive oil and the onions. Cook stirring occasionally until onions are golden and caramelized about 20 minutes. Stir in balsamic vinegar and cook 2 more minutes. Remove onions from skillet and set aside.
Cook mushrooms:
In the same skillet add remaining 1 tablespoon olive oil. Add mushrooms and cook until softened and golden about 6 to 8 minutes. Add garlic thyme salt and pepper cook for 1 minute. Remove from heat.
Prepare dough:
On a lightly floured surface roll out the dough into a 12x8-inch (30x20 cm) rectangle or oval. Transfer to a parchment-lined baking sheet or preheated pizza stone.
Assemble flatbread:
Evenly spread the caramelized onions over the dough. Top with mushrooms then sprinkle with mozzarella and goat cheese (or feta).
Bake:
Bake for 12 to 15 minutes until the crust is golden and the cheese is bubbly and lightly browned.
Serve:
Remove from oven sprinkle with fresh parsley if desired slice and serve warm.
Deliciously crispy caramelized onion & mushroom flatbread, perfect for sharing at gatherings.  Save It
Deliciously crispy caramelized onion & mushroom flatbread, perfect for sharing at gatherings. | zetluna.com

This recipe always brings the family together for a tasty and easy meal occasion.

Pairing Suggestions

Pair with a crisp white wine like Sauvignon Blanc or a light lager beer for the perfect balance.

Storage Tips

Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven to maintain crispness.

Variations

Try adding arugula or a drizzle of truffle oil just before serving to elevate the flavors.

Warm sliced caramelized onion & mushroom flatbread, ideal as a vegetarian appetizer or light meal. Save It
Warm sliced caramelized onion & mushroom flatbread, ideal as a vegetarian appetizer or light meal. | zetluna.com

This flatbread is a crowd-pleaser that’s simple yet full of flavor perfect for any occasion.

Common Questions About Recipes

How do you caramelize onions properly?

Slice onions thinly and cook over medium heat with olive oil, stirring occasionally until they turn golden brown and sweet, about 20 minutes.

Can I use a different type of cheese?

Yes, substituting goat cheese with feta or other soft cheeses adds tangy creaminess complementing the savory toppings.

What mushrooms work best for this dish?

Cremini or button mushrooms provide an earthy flavor and tender texture that enhances the flatbread’s savory profile.

Is it possible to prepare this flatbread gluten-free?

Definitely. Using a gluten-free pizza crust allows you to enjoy this dish without gluten concerns.

What cooking tools are essential?

A large skillet for sautéing, a rolling pin to shape the dough, and a baking sheet or pizza stone for baking are recommended.

How can I add extra flavor before serving?

Try topping with arugula or drizzling truffle oil after baking for enhanced aroma and taste.

Caramelized Onion Mushroom Flatbread

Flatbread layered with caramelized onions, mushrooms, melted cheese, and fresh herbs for a flavorful dish.

Prep Time
20 mins
Time to Cook
35 mins
Overall Time
55 mins
Authored by Clara

Recipe Type Retro American Dishes

Skill Level Required Medium

Cuisine Type Contemporary American

Recipe Output 4 Number of Portions

Dietary Needs Veggie-Friendly

The Ingredients You'll Need

Dough

01 1 pound store-bought or homemade pizza dough

Toppings

01 2 tablespoons olive oil
02 2 large yellow onions, thinly sliced
03 2 teaspoons balsamic vinegar
04 8 ounces cremini or button mushrooms, sliced
05 2 cloves garlic, minced
06 1 teaspoon fresh thyme leaves or ½ teaspoon dried thyme
07 ½ teaspoon salt
08 ¼ teaspoon black pepper
09 1 cup shredded mozzarella cheese
10 ½ cup crumbled goat cheese or feta
11 2 tablespoons chopped fresh parsley (optional)

Step-by-Step Instructions

Step 01

Preheat Oven: Set oven temperature to 450°F and place pizza stone inside if available to heat.

Step 02

Caramelize Onions: Heat 1 tablespoon olive oil in a large skillet over medium heat, add onions and cook, stirring occasionally, until golden and caramelized, about 20 minutes. Stir in balsamic vinegar and cook 2 additional minutes. Remove and set aside.

Step 03

Cook Mushrooms: In the same skillet, add remaining 1 tablespoon olive oil, sauté mushrooms until softened and golden, about 6 to 8 minutes. Add garlic, thyme, salt, and pepper; cook 1 minute, then remove from heat.

Step 04

Prepare Dough: On a lightly floured surface, roll dough into a 12 by 8 inch rectangle or oval. Transfer to parchment-lined baking sheet or preheated pizza stone.

Step 05

Assemble Flatbread: Distribute caramelized onions evenly over dough, layer mushrooms on top, then sprinkle mozzarella and goat cheese or feta evenly.

Step 06

Bake Flatbread: Bake for 12 to 15 minutes until crust is golden and cheese is bubbly and lightly browned.

Step 07

Finish and Serve: Remove from oven, garnish with fresh parsley if desired, slice, and serve warm.

Tools You'll Need

  • Large skillet
  • Rolling pin
  • Baking sheet or pizza stone
  • Knife and cutting board

Allergy Information

Review each ingredient to identify allergens and consult an expert if needed.
  • Contains wheat (gluten) and dairy (cheese). Use gluten-free crust and vegan cheese alternatives to accommodate allergens.

Nutritional Facts (Per Serving)

Keep in mind these details are for general guidance and shouldn't replace professional advice.
  • Caloric Content: 365
  • Fats: 15 grams
  • Carbohydrates: 46 grams
  • Proteins: 13 grams