Crockpot French Onion Meatballs are a comforting and delicious twist on classic meatballs. They’re packed with tender, juicy beef meatballs simmered slowly in a rich, flavorful French onion sauce made with caramelized onions and a savory broth. The slow cooker makes the whole process easy and hands-off, so you get loads of flavor with very little effort.
I love making these meatballs when I want a warm, cozy meal without spending all day in the kitchen. The onions get so sweet and soft as they cook, and the sauce thickens just enough to cling to every meatball. I usually like to double the recipe because they’re always a big hit with my family and friends—they can’t get enough of the mix of meat and that irresistible oniony sauce.
These meatballs are perfect served over egg noodles, mashed potatoes, or even on a soft roll for a hearty sandwich. I also find that a side of green veggies or a simple salad balances the meal nicely. If you’re looking for a comforting dinner that’s easy to prepare and packed with flavor, this crockpot French onion meatballs recipe is a winner every time!
Key Ingredients & Substitutions
Ground Beef: I like using a mix of beef and pork for juicy, flavorful meatballs. If you prefer leaner options, turkey or chicken work too but may be a bit less moist.
Yellow Onions: These sweet onions caramelize perfectly and give the sauce its rich depth. Sweet or vidalia onions can be a good alternative if you find them.
Breadcrumbs: They help keep meatballs tender. If you need gluten-free, use gluten-free breadcrumbs or crushed oats instead.
Beef Broth: A key to the sauce’s savory base. Low-sodium broth allows better control of salt. Vegetable broth can be swapped if you want a lighter taste.
Grated Parmesan: Adds umami and subtle nuttiness. You can skip or replace it with a vegan cheese if desired.
How Can You Perfectly Caramelize Onions for This Sauce?
Caramelizing onions slowly is the secret to the deep flavor in this dish. Here’s a simple way:
- Heat butter and oil over medium heat in a wide pan.
- Add sliced onions and sprinkle lightly with salt to help release moisture.
- Cook with occasional stirring for 25-30 minutes, making sure not to rush by turning the heat too high.
- The onions will gradually turn golden brown and sweet.
- Be patient, as this slow process builds the rich base for the sauce.
This step really makes the sauce shine and adds natural sweetness without any sugar.
Equipment You’ll Need
- Crockpot/slow cooker – perfect for slow cooking meatballs and onions without fuss.
- Large skillet – great for caramelizing onions evenly before adding to the crockpot.
- Mixing bowl – to combine meatball ingredients easily and shape them.
- Wooden spoon or spatula – ideal for stirring onions without scratching your pan.
- Measuring cups and spoons – for accurate ingredient amounts, especially spices and broth.
Flavor Variations & Add-Ins
- Use ground turkey or chicken for a lighter, leaner meatball option that still tastes great.
- Add chopped mushrooms to the meatball mix for extra moisture and a slight earthiness.
- Stir in shredded Swiss or Gruyère cheese on top before serving for a melty, French onion twist.
- Include fresh thyme or rosemary instead of dried thyme for a brighter herb flavor.
How to Make Crockpot French Onion Meatballs?
Ingredients You’ll Need:
For The Meatballs:
- 1 1/2 pounds ground beef (or a mix of beef and pork)
- 1/2 cup breadcrumbs
- 1/4 cup grated Parmesan cheese
- 1/4 cup finely chopped parsley, plus more for garnish
- 2 cloves garlic, minced
- 1 teaspoon Worcestershire sauce
- 1 large egg
- Salt and freshly ground black pepper, to taste
For The French Onion Sauce:
- 3 large yellow onions, thinly sliced
- 2 tablespoons butter
- 2 tablespoons olive oil
- 3 cups beef broth
- 1 tablespoon balsamic vinegar (optional, for depth)
- 1 teaspoon dried thyme
- 2 tablespoons all-purpose flour or cornstarch (for thickening)
How Much Time Will You Need?
This recipe takes about 45 minutes of active preparation time, mainly for shaping meatballs and caramelizing onions, followed by 3 to 8 hours of slow cooking in the crockpot depending on your chosen setting.
Step-by-Step Instructions:
1. Prepare the Meatballs:
In a large bowl, gently mix together the ground beef, breadcrumbs, Parmesan cheese, chopped parsley, minced garlic, Worcestershire sauce, egg, salt, and pepper. Once combined, shape the mixture into meatballs about 1 1/2 inches in size. Set them aside for now.
2. Caramelize the Onions:
In a large skillet over medium heat, melt the butter with olive oil. Add the sliced onions and a pinch of salt. Stir occasionally as you cook the onions until they turn a deep golden brown, caramelized and sweet, about 25 to 30 minutes.
3. Make the French Onion Sauce:
To the caramelized onions, add the beef broth, balsamic vinegar (if using), and dried thyme. Bring this mixture to a gentle simmer.
4. Thicken the Sauce:
Mix the flour or cornstarch with 2 tablespoons of water to make a smooth slurry. Stir this into the onion and broth mixture. Cook for a few more minutes until the sauce begins to thicken slightly.
5. Combine Ingredients in the Crockpot:
Transfer the onion sauce to your crockpot. Carefully place the meatballs in the sauce, making sure most are covered.
6. Slow Cook:
Cover and cook on low for 6-8 hours or on high for 3-4 hours. The meatballs should be tender and fully cooked through.
7. Serve and Enjoy:
Spoon the meatballs with plenty of French onion sauce over mashed potatoes, egg noodles, or rice. Garnish generously with fresh chopped parsley. Serve warm and enjoy your hearty, comforting crockpot meal!
Can I Use Frozen Meatballs for This Recipe?
Yes, you can use frozen meatballs! Just make sure to add extra cooking time—cook on low for about 8-9 hours or on high for 4-5 hours to ensure they’re heated through and tender.
How Do I Store Leftovers?
Store any leftover meatballs and sauce in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove or in the microwave, stirring occasionally for even warming.
Can I Make This Recipe Ahead of Time?
Absolutely! You can prepare the meatballs and caramelized onions a day ahead. Store them separately and combine in the crockpot to cook when you’re ready.
What Should I Serve with Crockpot French Onion Meatballs?
These meatballs are delicious served over mashed potatoes, egg noodles, or rice to soak up the rich onion sauce. Pair with steamed vegetables or a fresh green salad for a balanced meal.
