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Savory French Onion Soup Dip with Gruyere Crostini

French onion soup dip - featured image
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A rich and comforting French onion soup dip featuring slow caramelized onions and nutty Gruyere cheese, served warm on crisp crostini. Perfect for parties, snacks, or cozy nights in.

Ingredients

Scale
  • 3 large yellow onions, thinly sliced
  • 3 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 cloves garlic, minced
  • 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
  • ½ cup sour cream (full-fat)
  • ½ cup cream cheese, softened
  • 1 cup grated Gruyere cheese (reserve some for topping)
  • Salt and freshly ground black pepper, to taste
  • 1 teaspoon Worcestershire sauce
  • Baguette, sliced into ¼-inch rounds
  • 2 tablespoons olive oil (for brushing crostini)
  • Additional grated Gruyere (for melting on crostini)
  • Fresh thyme sprigs (optional, for garnish)

Instructions

  1. In a large skillet, heat 3 tablespoons unsalted butter and 1 tablespoon olive oil over medium heat. Add thinly sliced onions and stir to coat. Cook gently for 30-35 minutes, stirring every few minutes until onions are deep golden brown and caramelized. Add a splash of water if onions start to stick.
  2. Stir in minced garlic and fresh thyme leaves. Cook for 2 minutes until fragrant, being careful not to burn the garlic.
  3. In a mixing bowl, whisk together ½ cup sour cream and ½ cup softened cream cheese until smooth. Add the caramelized onion mixture and 1 teaspoon Worcestershire sauce. Season with salt and freshly ground black pepper to taste. Stir gently until combined.
  4. Fold in 1 cup grated Gruyere cheese, reserving some for topping the crostini.
  5. Preheat oven to 375°F (190°C). Arrange baguette slices on a baking sheet, brush with 2 tablespoons olive oil, and toast for about 8 minutes until crisp and golden, flipping halfway through.
  6. Spoon a generous amount of dip onto each crostini, sprinkle with reserved Gruyere cheese, and return to oven for 3-5 minutes until cheese melts and bubbles.
  7. Garnish with fresh thyme sprigs if desired and serve warm immediately.

Notes

Caramelize onions low and slow to avoid burning and achieve deep sweetness. Use good quality Gruyere cheese for best flavor and melting. The dip can be made ahead and reheated gently. For dairy-free or vegan options, substitute sour cream and cream cheese with plant-based alternatives and use olive oil instead of butter. Skip Worcestershire sauce or use vegetarian versions for vegetarian diets. Crostini can be swapped with baked zucchini rounds or roasted bell pepper slices for a low-carb option.

Nutrition

Keywords: French onion soup dip, Gruyere crostini, caramelized onion dip, party appetizer, easy dip recipe, savory dip, cheese dip

Find it online: https://chrisfeasts.com/savory-french-onion-soup-dip-with-gruyere-crostini-easy-recipe-for-parties/