French Onion Crostini

Rich, savory French Onion Crostini with caramelized onions, melted gruyére, and fresh thyme. An easy to make appetizer recipe that's perfect for the holidays!

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Prep Time: 10

Cook Time: 20

Total Time: 30

Servings:

Calories: 151kcal

Author: Cathy Trochelman

Ingredients

1 French baguette cut into 12 thin slices
1/4 pound Gruyére cheese cut into 12 pieces
1 large or 2 small Vidalia onions cut in half lengthwise and thinly sliced
2 Tablespoons salted butter
1 cup beef broth
1 Tablespoon cooking sherry
1/2 Tablespoon flour
1/2 teaspoon sugar
1/2 teaspoon worcestershire sauce
1 bay leaf
fresh thyme for garnish

Instructions

Melt the butter in a large skillet over medium heat. Add the sliced onions and cook for 5 minutes, stirring constantly, over medium heat. Reduce heat to low, cover, and cook for an additional 10-15 minutes or until golden brown. Stir onions periodically to prevent burning.
To the onions, add the broth, cooking sherry, sugar, flour, worcestershire sauce, and bay leaf. Bring to a boil, then reduce heat to medium and continue cooking until most of the liquid has evaporated, about 7-8 minutes.
While the onion mixture is reducing, top the baguette slices with sliced cheese and place on a rimmed baking sheet. Bake at 350°F for 6-8 minutes or until cheese is melted and bubbly.
Divide the onion mixture evenly among the crostini; garnish with fresh thyme and fresh cracked pepper.

Notes

Pro Tips

Slice your baguette in advance and store it in an airtight container or ziploc bag.
Slice your onions in advance and store them in an airtight container in the refrigerator.
Be sure to cook your onions low & slow (see "how to caramelize onions" above)
If you want a LOT of onions on your crostini, make double the onions. They cook down quite a bit!
For best flavor, serve immediately after assembling.

Nutrition