Caramelized Onion Bruschetta with Mushrooms

Caramelized onion bruschetta is a timeless appetizer that is sure to impress your guests. The sweet and savory flavors of the onions paired with the crispiness of the bread and the earthiness of the mushrooms create a truly delicious bite. This appetizer is also incredibly easy to make, so it’s perfect for any occasion, from a casual get-together to a formal dinner party.

Why You’ll Love This Savory Onion Bruschetta Recipe

Caramelized onion bruschetta is popular all year round, but it is especially popular during the fall and winter months. The warm, comforting flavors of the dish are perfect for a cold day. Caramelized onion bruschetta is also a popular choice for holiday parties and gatherings.

• Incredibly easy to make. Even beginner cooks can master this recipe.
• It’s versatile. You can serve it as a simple appetizer, or you can dress it up by adding different toppings, such as goat cheese, fresh herbs, or balsamic glaze.
• Budget-friendly. No expensive gourmet ingredients. Everything to make this bruschetta recipe with onions is simple and affordable.
• It’s customizable. You can adjust the sweetness and savoriness of the onions to your liking.
• Simply delicious! The combination of caramelized onions, crispy bread, piquant mushrooms and melted Swiss cheese is simply irresistible.

Bruschetta with Caramelized Onion Ingredients

You will be caramelizing the onions, and then sauteing the mushrooms until their moisture is cooked off. Just be careful to not dry the mushrooms out too much.

• Bread: Italian bread cut into 18 slices.
• Pantry: Olive oil, salt.
• Produce: Onions, mushrooms, garlic, fresh thyme.
• Dairy: Swiss cheese slices, cut in half.

Full ingredient amounts and directions are in the recipe card below.

How To Make Bruschetta With Caramelized Onions

Caramelizing onions deepens and sweetens their flavors. The process can take some patience but is worth it.  Once the onions start to brown and release their sugars it may look as if the bottom of the pan is burning but just add water to release the sugars from the pan and stir it into the onion mixture. 

Once you add the mushrooms to the mixture they will release some of their liquid and help keep the sugars from sticking as well.

TIP: You could double or triple the batch of caramelized onions and use the extras to add amazing flavor to cheese omelets, smoked baked potatoes, steaks or our onion and cheese quiche.  This mixture also freezes well, just divide it into separate servings and place in a sealed container for a quick weeknight condiment.

Toast The Bruschetta Slices

1. Place the slices of bread on a baking sheet, Use 2 tablespoons of olive oil to brush on one side of the slices.
2. Place the baguette slices under the broiler for 1-2 minutes until they are golden. Set aside. Turn off the oven.

How To Caramelize Onions

Caramelizing onions deepens and sweetens their flavors. The process can take some patience but is worth it. Once the onions start to brown and release their sugars it may look as if the bottom of the pan is burning but just add water to release the sugars from the pan and stir it into the onion mixture.

Once you add the mushrooms to the mixture they will release some of their liquid and help keep the sugars from sticking as well.

3. Heat 2 tablespoons of the olive oil in a skillet over medium heat. Add the onion slices and cook until the onions caramelize and are soft and a deep brown, about 25 to 30 minutes, Transfer to a dish and reserve.

Saute The Mushrooms Until Moisture Cooks Off

4. In the same skillet set over medium heat add the mushroom slices. Cover and cook, stirring occasionally for 8-10 minutes until the mushrooms have released their liquid.
5. Remove the lid, add the remaining 2 tablespoons of oil and cook until the mushrooms are a golden brown. Add the garlic, fresh thyme and salt. cook for another 30 seconds until the garlic is soft and fragrant. Transfer to a dish and set aside.

Assemble The Bruschetta with Caramelized Onions and Mushrooms

6. With the toasted bread on the baking sheet, add a portion of the cheese to each bread slice, transfer to the oven and allow the cheese to melt slightly. Remove the baking sheet from the oven and assemble the bruschetta.
7. Divide the onion and mushrooms over each of the slices of bread, and garnish with fresh herbs. Transfer the bruschetta to a platter and serve warm or at room temperature

Serving Suggestions

Caramelized onion bruschetta can be served as a simple appetizer, or you can dress it up by adding different toppings. Here are a few ideas:

• Goat cheese
• Fresh herbs, such as basil, thyme, or rosemary
• Balsamic glaze
• Crumbled bacon
• Fried capers
• Arugula leaves

Substitutions and Variations

Here are a few substitutions and variations when making this caramelized onion appetizer recipe:

• If you don’t have a baguette, you can use any other type of bread, such as ciabatta, sourdough, or rye.
• To add a bit of sweetness, add a drizzle of honey or maple syrup to the caramelized onions.
• For a spicier version of this recipe, add a pinch of red pepper flakes or chili powder to the caramelized onions.
• To add a bit of smokiness, add a pinch of smoked paprika to the caramelized onions.

Storage Options

• Caramelized onion bruschetta can be stored in the refrigerator for up to 3 days. To reheat, simply broil until the cheese is melted and bubbly.
• This savory appetizer can also be frozen for up to 3 months. To thaw, simply place them in the refrigerator overnight.
• To reheat frozen caramelized onions, simply thaw them and then cook them in a skillet over medium heat until heated through.

Tips For Success

• For the best flavor, use sweet onions, such as Vidalia or Walla Walla onions.
  
• To caramelize the onions quickly, add a pinch of sugar to the skillet.
  
• You could double or triple the batch of caramelized onions and use the extras to add amazing flavor to omelets, baked potatoes, steaks or anything that suits your fancy.
  
• Caramelized onions also freezes well, just divide it into separate servings and place in a sealed container for a quick weeknight condiment.
  

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