French Onion Crostini

Transform your next gathering with the irresistible elegance of French Onion Crostini, a gourmet appetizer that’s as easy to make as it is impressive. Featuring golden, caramelized onions cooked to perfection with rich beef broth, a splash of white wine, and fragrant thyme, this recipe captures all the comforting flavors of French onion soup in a bite-sized form. Crispy baked baguette slices serve as the perfect base, topped with smoky, melted Gruyère cheese for a decadently savory finish. Garnished with a touch of fresh parsley, these crostini are ideal for everything from cocktail parties to cozy dinner nights. With just 15 minutes of prep, this quick yet sophisticated dish lets you deliver gourmet flavors without the fuss.

Nutriscore Rating: 65/100

Prep Time:15 mins

Cook Time:50 mins

Total Time:65 mins

Servings: 8

Ingredients

• 3 tablespoons unsalted butter
• 1 tablespoon olive oil
• 4 large yellow onions
• 1 teaspoon granulated sugar
• 0.5 teaspoon salt
• 0.25 cup dry white wine
• 0.25 cup beef broth
• 1 teaspoon fresh thyme leaves
• 1 loaf baguette
• 2 tablespoons olive oil (for brushing)
• 1 cup Gruyère cheese
• 2 tablespoons parsley (optional, for garnish)

Directions

Step 1

Peel and thinly slice the yellow onions into even-sized half-moons.

Step 2

Heat 3 tablespoons of unsalted butter and 1 tablespoon of olive oil in a large skillet or sauté pan over medium heat.

Step 3

Add the sliced onions to the pan and stir to coat them evenly. Sprinkle with 1 teaspoon of granulated sugar and 0.5 teaspoon of salt.

Step 4

Cook the onions on medium-low heat, stirring frequently, until they are caramelized and golden brown. This should take 30-35 minutes.

Step 5

Once the onions are caramelized, deglaze the pan by adding 0.25 cup of dry white wine. Stir and cook for 2-3 minutes until the liquid is mostly evaporated.

Step 6

Add 0.25 cup of beef broth and 1 teaspoon of fresh thyme leaves. Cook for another 2-3 minutes, then remove the pan from heat. Set the onions aside.

Step 7

Preheat the oven to 375°F (190°C).

Step 8

Slice the baguette into 1/2-inch thick slices. You should get 16-18 slices.

Step 9

Arrange the slices on a baking sheet and brush both sides lightly with 2 tablespoons of olive oil.

Step 10

Toast the baguette slices in the oven for 5-7 minutes, or until lightly golden and crisp.

Step 11

Grate 1 cup of Gruyère cheese and set aside.

Step 12

Top each toasted baguette slice with a generous spoonful of the caramelized onions, spreading them evenly.

Step 13

Sprinkle grated Gruyère cheese over the onions on each crostini.

Step 14

Place the crostini back into the oven and bake for an additional 5-7 minutes, or until the cheese is melted and bubbly.

Step 15

Remove the crostini from the oven and let cool for 2-3 minutes.

Step 16

Garnish with chopped parsley (if desired) and serve warm.

Nutrition Facts

Serving size	1267 grams (1267.0g)

Amount per serving	% Daily Value*
Calories	2399

Total Fat 128.40g	165%
Saturated Fat 54.00g	270%
Polyunsaturated Fat 3.60g
Cholesterol 238mg	79%
Sodium 4328mg	188%
Total Carbohydrate 231.20g	84%
Dietary Fiber 17.60g	63%
Total Sugars 45.90g
Protein 81.80g	164%

Vitamin D 32IU	159%
Calcium 1650mg	127%
Iron 14mg	80%
Potassium 1453mg	31%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 48.0%

Protein: 13.6%

Carbs: 38.4%