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French Onion Meatballs in the Crockpot (Simple Recipe)

A woman with long brown hair wearing a light-colored blouse smiles at the camera in a softly lit indoor setting, offering a welcoming glimpse into the post author's personality.Sarah Mock headshot 100by100.
Updated: to include new step-by-step photos, clarified instructions, and/or improved tips for best results.· by · Leave a Comment This post contains affiliate links.

This Crockpot French Onion Soup Meatballs recipe is the ultimate comfort food that's both easy to make and incredibly flavorful.

Prep Time 10 minutes
cook time3 hours
total time3 hours 10 minutes
servings adjustable10 servings
Jump to Recipe
French onion meatballs topped with melted cheese and herbs simmer gently in a thick sauce, being stirred with a wooden spoon.

With tender meatballs, caramelized onions, and a rich, cheesy topping, this dish is sure to become a family favorite. Plus, it's made entirely in the slow cooker, so you can set it and forget it and without onion soup mix!

If you love my crockpot grape jelly meatballs but want to have another savory option to serve THESE are the meatballs I would suggest.

Ingredients

Discover a delightful blend of flavors with this French onion meatballs recipe. Just toss frozen meatballs, onion slices, minced garlic, Gruyere cheese, and more into your crockpot for an effortless meal. Let the rich aromas infuse every bite until you're ready to indulge!.

For the Meatballs:

  • 36 oz frozen meatballs (beef, turkey, or Italian-style)

For the Sauce:

  • 2 sweet onions, large, thinly sliced into ¼-inch half-moons
  • 4 garlic cloves, minced
  • 2 cups beef broth, low-sodium
  • 1 (10.5 oz) can condensed French onion soup
  • 1 tablespoon balsamic vinegar
  • 1 ½ teaspoons fresh thyme, minced (or ½ teaspoon dried thyme)
  • ¾ teaspoon black pepper, to taste
  • 2 tablespoons cornstarch

For Topping:

  • 1 cup Gruyere cheese, shredded (or substitute: Comte, Fontina, Provolone, Swiss, or Mozzarella)

For Garnish (Optional):

  • Fresh thyme or parsley, chopped

Substitutions

  • Homemade Meatball - Feel free to make your own homemade meatballs. Be sure to pre-bake the meatballs to an internal temperature reaches 160-165°F.
  • Cheese - If Gruyere isn't available, try Comte, Fontina, Provolone, Swiss, or Mozzarella for a similar melty texture.
  • Balsamic Vinegar -  Substitute with red wine vinegar or Worcestershire sauce for a slightly different flavor profile.
Crockpot French Onion Meatballs (Easy Slow Cooker Recipe)
Sarah Mock, savoring a glass of red wine, smiles warmly indoors near a staircase. With her long brown hair and light blouse, she exudes relaxed elegance in this candid headshot.Sarah Mock
Need a dish that's perfect for parties or a comforting family meal? These Crockpot French Onion Soup Meatballs are bursting with rich, savory flavors and couldn't be easier to make-just toss everything in the slow cooker and let it do the work for you!
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Crockpot meatballs drenched in melted cheese and infused with the rich flavor of French onion soup, a wooden spoon lifting some out.
Prep Time10 minutes
Cook Time3 hours
Prep Time3 hours 10 minutes
servings10 servings

Ingredients

  • 36 ounce frozen meatballs
  • 2 large sweet onions thinly sliced into half moons
  • 3-5 garlic cloves minced
  • 2 Cups low sodium beef broth
  • 1 10.5 oz can condensed French onion soup
  • 1 tablespoon balsamic vinegar
  • 1 ½ teaspoons fresh thyme minced
  • ¾ Teaspoon black pepper to taste
  • 2 tablespoons Cornstarch
  • 1 Cup shredded Gruyere cheese
  • Fresh thyme or parsley for garnish (optional)

Instructions

  1. Place frozen meatballs in crockpot.
  2. Top with sliced onions and minced garlic.
In a mixing bowl or large measuring cup, combine the beef broth, French onion soup, balsamic vinegar, thyme, black pepper, and cornstarch. Whisk well to combine.
  3. Pour mixture over the meatballs, onions, and garlic.
  4. Cover with lid and cook on LOW for 3-5 hours, until the meatballs are fully heated through. Stir halfway through cooking time to ensure even heating and to make sure the sauce is not burning on the bottom of the pan.
  5. Right before serving, top the meatballs with the shredded gruyere cheese. Cover with lid and cook for an additional 5-10 minutes, until the cheese is fully melted.
  6. Garnish with fresh chopped parsley or thyme if desired. Serve as an appetizer or over mashed potatoes or egg noodles. Enjoy!

Nutrition

Serving: 1 | Calories: 13kcal | Carbohydrates: 2g | Protein: 1g | Fat: 0.02g | Saturated Fat: 0.004g | Polyunsaturated Fat: 0.01g | Monounsaturated Fat: 0.001g | Sodium: 89mg | Potassium: 105mg | Fiber: 0.1g | Sugar: 0.2g | Vitamin A: 15IU | Vitamin C: 1mg | Calcium: 4mg | Iron: 0.1mg

Notes

Instead of gruyere, you can opt for another melty cheese such as comte, fontina, provolone, swiss, or even mozzarella.
I highly recommend shredding a block of cheese for the best meltability. Packaged pre-shredded cheeses often contain anti-caking agents to prevent clumping.
Instead of a can of condensed french onion soup, you can opt to use an envelope of french onion soup mix.
CourseCrock-Pot Recipes
CuisineAmerican
KeywordFrench Onion Meatballs

Helpful Kitchen Tools

A large black and silver Crockpot filled with mixed vegetables and sauce is set to the "Low" heating option.

Sarah's recommendation

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How to make French onion meatballs in the crockpot

A crockpot brimming with French onion meatballs is layered with sliced onions and topped off with aromatic minced garlic.

Prepare the Crockpot

  • Place the frozen meatballs in the crockpot.
  • Top with the sliced onions and minced garlic.
A glass bowl of light brown marinade with herbs, perfect for your French onion meatballs, rests on a plain white surface.

Make the Sauce

In a mixing bowl or large measuring cup, whisk together the beef broth, condensed French onion soup, balsamic vinegar, thyme, black pepper, and cornstarch until smooth.

A crockpot brimming with French onion meatballs, bathed in a savory brown sauce and mingling with tender sliced onions.

Combine

  • Pour the sauce mixture over the meatballs, onions, and garlic.
  • Stir gently to coat.

Cook

  • Cover with the lid and cook on LOW for 3-5 hours, or until the meatballs are heated through and the onions are tender.
  • Stir halfway through cooking to ensure even heating and prevent burning.
In a cozy crockpot, French onion meatballs nestle under a blanket of shredded cheese, creating an inviting view from above.

Add the Cheese

  • Right before serving, sprinkle the shredded Gruyere cheese evenly over the meatballs.
  • Cover and cook for an additional 5-10 minutes, or until the cheese is melted and bubbly.
Crockpot French onion meatballs, perfectly slow-cooked with cheesy goodness and topped with fresh herbs in a rich, dark sauce.

Serve

  • Garnish with fresh thyme or parsley, if desired.
  • Serve as an appetizer or over mashed potatoes, egg noodles, or cauliflower mash.

Cheese Tip

For the best melt-a-bility, shred your own cheese from a block. Pre-shredded cheeses often contain anti-caking agents that can affect texture.

Did you make this recipe?

Do you have feedback that would be helpful to others? If so can help this small business owner by leaving a rating and a review in the comments section? Thank you for being part of the Savoring The Good Community. ~ Sarah

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This is the best homemade seedless black raspberry jam recipe made with fresh or frozen black raspberries.

Black Raspberry jam Recipe

Storage Tips

Allow the dish to cool completely before storing. Transfer to an airtight container and refrigerate for up to 3-4 days. Reheat gently on the stovetop or in the microwave.

Serving Tip

Try serving with crusty baguette slices or crostini for dipping.

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Reheating Instructions

Here are simple and clear reheating instructions for this recipe, covering microwave, stovetop, and oven methods. The stovetop method is my personal preferred method. I feel like the gentle heating maintains the tenderness of the meatballs.

Microwave Method

  • Place a single serving in a microwave-safe dish.
  • Cover loosely and heat on medium power for 1-2 minutes, stirring halfway.
  • Add a splash of broth if the sauce is too thick.

Stovetop Method

  • Warm meatballs and sauce in a skillet over medium-low heat.
  • Stir occasionally and add broth if needed.

Oven Method

  • Preheat oven to 350°F.
  • Place meatballs and sauce in an oven-safe dish, cover with foil, and bake for 15-20 minutes.

Tips for Reheating

Avoid Overheating: Reheat only until warmed through to prevent the meatballs from becoming tough or the sauce from separating.
Add Moisture: If the sauce thickens too much during storage, add a splash of beef broth or water while reheating.
Cheese Refresh: If the cheese has solidified, adding a little extra shredded cheese while reheating can restore the gooey, melty texture.

Frequently asked questions, answers and tips:

How can I make this recipe lower in sodium?

Opt for low-sodium beef broth and a low-sodium version of condensed French onion soup. Taste and adjust seasoning after cooking if needed.

Sarah Mock of savoringthegood.com headshot 2022

I am Sarah Mock. Welcome!

Sarah Mock is a classically trained Chef and graduate of Johnson & Wales University. A culinary blogger for 16 years Sarah helps the home cook prepare her recipes with professional results.

Get to know me

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