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5 from 1 vote

Crostini with Caramelized Onions, Melted Cheese & Sage

A little sweet, a little savory - these crostini with caramelized onions and melted cheese are the perfect comfort food appetizers.
Prep Time15 mins
Cook Time40 mins
Total Time55 mins
Course: Appetizers
Cuisine: Italian
Keyword: Healthy Appetizers
Servings: 24 Crostini
Calories: 66kcal


  • 1 baguette cut on diagonal into 1/2-inch slices
  • 3 tablespoons olive oil divided
  • 3 large yellow onions peeled and sliced thinly into semicircles
  • 1 tablespoon brown sugar
  • 1/2 cup water divided
  • 1 tablespoon balsamic vinegar
  • 1/2 teaspoon kosher salt
  • 1 tablespoon minced fresh sage
  • 3 ounces Pecorino Romano cheese


  • Preheat oven to 350 degrees F.
  • Place baguette slices on a baking sheet and brush with about 2 tablespoons olive oil. Bake until lightly toasted, about 5 minutes. Set aside.
  • For the onions, heat 1 tablespoon olive oil in a large skillet over medium heat.
  • Add the onions and cook until softened, about 15 minutes.
  • Stir in brown sugar. Cover and cook until the onions are golden brown, about 20 minutes, stirring occasionally.
  • Add ¼ cup water, cover the pan again and cook until the onions are deep golden brown, about 15 minutes.
  • Stir in balsamic vinegar, salt, sage and an additional ¼ cup water. Cover the pan and cook until the liquid is absorbed. Remove from heat.
  • Using a vegetable peeler, shave off Pecorino Romano slices, one for each baguette slice.
  • Divide the caramelized onions between the baguette slices and top each one with a slice of cheese.
  • Place in oven and bake until cheese is beginning to melt, 3 to 4 minutes. Serve.


Serving: 1Crostino | Calories: 66kcal | Carbohydrates: 7g | Protein: 2g | Fat: 3g | Saturated Fat: 1g | Cholesterol: 4mg | Sodium: 156mg | Potassium: 35mg | Fiber: 1g | Sugar: 1g | Vitamin A: 15IU | Vitamin C: 1mg | Calcium: 51mg | Iron: 0.4mg