Description
Experience the ultimate comfort with this Deep Flavor Slow Cooker French Onion Soup, featuring sweet caramelized onions and rich beef broth. Perfect for impressing family or guests with minimal effort!
Ingredients
Scale
- 4–5 large Yellow Onions
- 1–2 Sweet Onions (like Vidalia or Walla Walla)
- small amount of Red Onions (optional)
- High-Quality Beef Broth or Stock
- Unsalted Butter
- 1–2 tablespoons of All-Purpose Flour
- 1–2 tablespoons of Balsamic Vinegar or Apple Cider Vinegar
- 2 Bay Leaves
- Fresh Thyme sprigs
- Salt
- Freshly Ground Black Pepper
- Crusty Bread (Baguette or Sourdough), sliced about ¾-inch thick
- Gruyere Cheese
Instructions
- In a large, heavy-bottomed pot or Dutch oven, melt butter over medium-low heat.
- Add your thinly sliced onions and stir to coat them in butter.
- Cook, stirring frequently at first, then occasionally, for about 30-45 minutes until they are deep golden-brown.
- Sprinkle the flour over the caramelized onions and stir constantly for 1-2 minutes to create a light roux.
- Carefully pour in your non-alcoholic flavor boost (balsamic vinegar or apple cider vinegar mixed with broth) and let it simmer for a minute until slightly reduced.
- Transfer the caramelized onions and any liquids into your slow cooker insert.
- Pour in the beef broth and add the bay leaves and fresh thyme sprigs.
- Season generously with salt and freshly ground black pepper.
- Cover the slow cooker and cook on LOW for 6-8 hours or on HIGH for 3-4 hours.
- Once cooking time is complete, remove and discard the bay leaves and thyme sprigs.
- Taste the soup and adjust the seasoning as needed.
- Preheat your oven broiler while slicing the crusty bread and arranging it on a baking sheet.
- Broil the bread for 1-3 minutes until lightly golden and toasted.
- Ladle the hot soup into oven-safe bowls and float a piece of toasted bread on top of each bowl.
- Generously pile shredded Gruyere cheese over the bread and place the bowls on a baking sheet.
- Carefully transfer them to the preheated broiler and broil for 2-4 minutes until the cheese is bubbly and golden brown.
- Remove from the oven and let cool for a minute before serving.
- Prep Time: 15 mins
- Cook Time: 6-8 hours
- Category: Soup
- Method: Slow Cooking
- Cuisine: French
Nutrition
- Serving Size: 1 bowl
- Calories: 350
- Sugar: 10 g
- Sodium: 800 mg
- Fat: 20 g
- Saturated Fat: 10 g
- Unsaturated Fat: 5 g
- Trans Fat: 0 g
- Carbohydrates: 30 g
- Fiber: 2 g
- Protein: 15 g
- Cholesterol: 40 mg
Keywords: Patience with the caramelization of the onions is key for deep flavor. Quality broth is essential for a rich taste, and don't forget to add a splash of acid to brighten the flavors.