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Savory Caramelized Onion and Mushroom Crostini
Alyssa

Savory Caramelized Onion and Mushroom Crostini

Savor the perfect appetizer with caramelized onion and mushroom crostini—crispy bread topped with sweet onions, savory mushrooms, and fresh herbs.
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Ingredients Method

Ingredients
  

  • 1 baguette sliced into 1/2-inch rounds
  • 3 tablespoons olive oil divided
  • 1 clove garlic halved
  • 2 large onions thinly sliced
  • 2 tablespoons unsalted butter
  • 8 ounces cremini or button mushrooms thinly sliced
  • 2 teaspoons fresh thyme leaves or 1 teaspoon dried thyme
  • 1 tablespoon balsamic vinegar
  • Salt and black pepper to taste
Optional Garnishes:
  • 1/4 cup crumbled goat cheese or grated Parmesan
  • Fresh parsley or chives chopped

Method
 

  1. Prepare the Baguette: Preheat your oven to 375°F (190°C). Arrange the sliced baguette on a baking sheet. Brush each slice generously with 3 tablespoons of olive oil. Bake for 8–10 minutes until the bread is golden and crisp. Once done, remove from the oven and rub the warm bread with the halved 1 clove of garlic to infuse its flavor.
  2. Caramelize the Onions: In a large skillet, melt 2 tablespoons of unsalted butter with 1 tablespoon of olive oil over medium heat. Add the 2 large thinly sliced onions along with a pinch of salt. Cook for about 20–25 minutes, stirring occasionally, until the onions become soft and golden brown. Towards the end of cooking, drizzle in 1 tablespoon of balsamic vinegar to enhance sweetness.
  3. Sauté the Mushrooms: In the same skillet, add the remaining 2 tablespoons of olive oil if needed. Add 8 ounces of thinly sliced cremini or button mushrooms along with 2 teaspoons of fresh thyme leaves, a pinch of salt, and black pepper to taste. Cook for 8–10 minutes, stirring frequently, until the mushrooms are tender and golden.
  4. Assemble the Crostini: On each baguette slice, generously spoon a combination of the caramelized onions and sautéed mushrooms. If desired, sprinkle with 1/4 cup of crumbled goat cheese or grated Parmesan to add creaminess and richness.
  5. Garnish and Serve: Finish off your crostini by scattering some chopped fresh parsley or chives on top for a vibrant color. The crostini can be served warm or at room temperature, making them perfect for any gathering.