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30-Minute French Onion Soup Crostini

This 30-Minute French Onion Soup Crostini is the perfectly fast and easy appetizer to enjoy on a cold winter night!
Prep Time10 minutes
Cook Time20 minutes
Total Time30 minutes
Course: Appetizer
Servings: 4 servings
Author: Taylor Stinson

Ingredients

  • 1 tbsp olive oil
  • 1 tsp butter
  • 2 yellow onions sliced
  • 1 clove garlic minced
  • 2 tbsp red wine
  • 1/2 tsp salt
  • 1/2 tsp pepper
  • 1 tsp chopped fresh thyme optional
  • 2 tbsp flour
  • 1 1/2 cups beef broth
  • 1 baguette thinly sliced on a diagonal OR 1 box prepared crostini crackers
  • Swiss cheese grated

Instructions

  • In a large pot, heat olive oil over medium heat. Add butter. Once butter is melted, add onions and garlic and sauté for 5 minutes, stirring often until onion becomes tender.
  • Add red wine, salt, pepper and thyme and sauté for another 5 minutes, stirring often.
  • Add flour gradually, stirring to coat onion mixture. Add beef broth slowly, whisking to avoid lumps.
  • Bring to a boil and then simmer, letting mixture reduce to the point where most of the liquid has evaporated, thickened and been absorbed by the onions.
  • Meanwhile, set oven to the highest broiler setting and prepare your crostinis on a baking sheet. If using a baguette, thinly slice on a diagonal and toast in the oven for a couple of minutes per side. You can toast the bread with or without olive oil and salt. If you want to save a bit of time, you can buy store-bought crostinis and directly spoon French onion mixture overtop without pre-toasting.
  • Once each crostini is topped with the onion mixture, finish with grated Swiss cheese and broil in the oven for about 1-2 minutes until cheese is melted.
  • Serve right away and enjoy! To make ahead, French onion mixture can be refrigerated for up to 48 hours and served on crostinis when guests arrive!