These French Onion Beef Sliders are tasty little sandwiches packed with juicy beef and rich, caramelized onions. Topped with melted cheese, they are perfect for any gathering!
What’s great is how easy they are to make—just sauté the onions and grill the patties. I love serving them at parties, and they disappear fast. Who could resist cheesy goodness? 🧀
Key Ingredients & Substitutions
Ground Beef: I recommend using 80/20 ground beef for the best flavor and juiciness. If you’re looking for a lighter option, you can substitute with ground turkey or chicken, though they will be less rich in flavor.
Onions: Yellow onions are perfect for caramelizing as they become sweet and delicious. If you have red onions, they can work too, but they may not get as sweet. Shallots are another great option for a milder taste!
Slider Buns: While I love using soft slider buns, any small bread rolls can work, like brioche or even pretzel rolls for a fun twist. You can also use lettuce wraps for a low-carb version!
Cheese: Swiss cheese is traditional, but Gruyere adds a lovely nutty depth. If you prefer something sharper, try cheddar or even blue cheese for a bolder flavor.
How Do I Caramelize Onions Perfectly?
Caramelizing onions can be tricky, but it’s all about patience. The key is cooking them low and slow.
- Start with medium-low heat; you’ll want to avoid burning.
- Add the sliced onions, butter, olive oil, sugar, and salt. Stir to coat them evenly.
- Let them cook for about 25-30 minutes, stirring occasionally. This slow cooking releases natural sugars, leading to that caramelized color.
- Finally, add broth in the last 5 minutes to enhance flavor and moisture. Adjust seasoning to your liking!
This technique makes your onions richly sweet and is crucial for the sliders. Enjoy the process; it’s worth the effort!
French Onion Beef Sliders
Ingredients You’ll Need:
For the Beef and Onions:
- 1.5 lbs ground beef (80/20 blend for juiciness)
- 2 large yellow onions, thinly sliced
- 2 tablespoons butter
- 1 tablespoon olive oil
- 1 teaspoon salt, divided
- 1/2 teaspoon freshly ground black pepper, divided
- 1 teaspoon sugar
- 1/2 cup beef broth (or French onion soup broth if desired)
For the Sliders:
- 8 slider buns or small dinner rolls
- 8 slices Swiss cheese or Gruyere cheese
- Fresh thyme sprigs, for garnish (optional)
- 1 teaspoon Worcestershire sauce (optional, to mix into the beef)
- Butter for toasting buns
How Much Time Will You Need?
This recipe takes about 15 minutes to prep the ingredients and approximately 30-35 minutes to cook, bringing the total time to around 50 minutes. With patience, you’ll have flavorful sliders that everyone will love.
Step-by-Step Instructions:
1. Caramelize the Onions:
In a large skillet, melt the butter with olive oil over medium-low heat. Add the thinly sliced onions, 1/2 teaspoon of salt, and sugar. Cook slowly, stirring occasionally for about 25-30 minutes, until the onions are deeply golden brown and caramelized. This slow cooking is what brings out the delicious sweetness!
2. Add the Broth:
Once the onions are caramelized, add the beef broth. Stir well, and allow it to cook for another 5 minutes, or until most of the liquid evaporates. Taste and adjust the salt and pepper if needed. Once done, remove from heat and set aside.
3. Make the Patties:
In a mixing bowl, combine the ground beef, Worcestershire sauce (if using), remaining salt, and pepper. Mix gently just until everything is combined—don’t overmix! Form the mixture into 8 small slider-sized patties.
4. Cook the Patties:
Preheat your grill or skillet over medium-high heat. Once hot, place the patties on the grill and cook for about 3-4 minutes on each side, or until they reach your preferred doneness. Make sure they’re cooked through.
5. Add Onions and Cheese:
In the last minute of cooking, generously top each patty with a spoonful of caramelized onions and a slice of Swiss or Gruyere cheese. Cover the grill or pan to help the cheese melt nicely.
6. Toast the Buns:
While the cheese melts, take the slider buns and lightly butter them. Place them face down on the grill or in another skillet, toasting them until golden and warm.
7. Assemble the Sliders:
To assemble, place each cheesy patty with onions on the bottom bun. Add the bun top and garnish with fresh thyme sprigs if desired.
8. Serve and Enjoy:
Serve these warm, melty sliders to your friends or family, and watch them disappear! Enjoy every bite of this deliciously rich and savory treat made easy!
This recipe perfectly combines the sweetness of caramelized onions and robust beef flavor, all under melting Swiss cheese, served on soft toasted buns. It’s a delightful miniature version of the classic French onion soup!
Can I Use Ground Turkey Instead of Beef?
Absolutely! Ground turkey can be a great substitute for a lighter option, but keep in mind it may result in a slightly drier slider. Consider adding a bit of oil or moisture to keep it juicy!
How Do I Store Leftovers?
Leftover sliders can be stored in an airtight container in the fridge for up to 3 days. To reheat, place them in the oven at 350°F (175°C) until warm, or microwave for a quick option. Add a sprinkle of water before microwaving to keep them moist.
Can I Freeze These Sliders?
Yes, you can freeze the patties before cooking! Form them into patties, place them in a single layer on a baking sheet to freeze, and then transfer them to an airtight container or freezer bag. They can be frozen for up to 3 months. Thaw in the fridge before cooking!
What Toppings Can I Add to These Sliders?
Feel free to get creative! You can add sautéed mushrooms, crispy bacon, or even a dollop of horseradish sauce for an extra kick. Pickles or fresh greens like arugula can also add a nice crunch.