Crockpot French Onion Soup
This easy slow cooker French onion soup is rich, cheesy, and full of flavor. Perfect for a cozy dinner on busy nights!
When the weather gets chilly, there's nothing cozier than a warm bowl of French onion soup. This version is made in the crockpot, making it a breeze to prepare while tackling everything else on my busy schedule. It's rich, cheesy, and tastes just like the restaurant-style soup we all love, but with way less effort!
Watch Jade make it
Instructions
Add onions, butter, brown sugar, salt, and pepper to the crockpot. Cook on high for 3-4 hours, stirring every 60 minutes if possible, until the onions are caramelized and golden.
Sprinkle in the flour, stir to coat, then add balsamic vinegar and broth. Add thyme if using.
Cover and cook for 3-4 hours on high or 6-8 hours on low until the broth is rich and savory.
Toast sourdough slices. Ladle soup into bowls, top with bread, and sprinkle generously with Gruyere. Let the cheese melt until gooey.
Garnish with green onions or chives if desired.
Tips for the Best Results
- Slice the onions thinly for even caramelization.
- Stir occasionally to prevent sticking, especially in the early cooking stages.
- Don't rush the caramelization; it's key for flavor.
- Use a good-quality beef broth for the best taste.
- Toast the bread just before serving for the perfect texture.
Variations & Substitutions
- Swap half the beef broth for chicken broth for a lighter flavor.
- Use a different cheese like mozzarella or cheddar if Gruyere isn't available.
- Add cooked mushrooms for extra umami.
- Stir in a splash of white wine for added depth.
- Make it vegetarian with vegetable broth and omit the cheese.
Storing Leftovers
Store leftovers in an airtight container in the fridge for up to 3 days. This soup can be frozen for up to 3 months, just be sure to leave out the bread and cheese until serving.
Reheating
Reheat on the stovetop over medium heat until warmed through, about 10-15 minutes. For the best results, add a splash of broth to maintain the soup's texture.
Frequently Asked Questions
Can I use a different type of onion?
Yes, you can use sweet onions or red onions for a different flavor profile.
Is this soup freezer-friendly?
Yes, but it's best to freeze without the bread and cheese added.
How can I make this vegetarian?
Use vegetable broth and skip the cheese or use a dairy-free alternative.
Can I cook this on low instead?
Absolutely! Just cook on low for 6-8 hours instead of high.
What bread works best for topping?
Sourdough is traditional, but you can use any crusty bread you like.
Jade
Hi, I'm Jade — a mom of 3 who believes dinner doesn't have to be complicated. I share easy weeknight recipes, real-life hacks, and everything that keeps our family fed and happy on even the busiest nights. Whether it's a slow cooker dump dinner or a 30-minute skillet meal, my goal is to help you get a home-cooked meal on the table without the stress.
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