Name: Gruyere Caramelized Onion Sliders
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 2 large yellow onions, thinly sliced; 2 tbsp butter (for caramelizing onions); 2–3 fresh thyme sprigs; 1 lb ground beef (80/20); 1 beef bouillon cube, crushed (or 1 tsp bouillon paste); 1 tsp dried onion flakes; 1/2 tsp celery seed; 1 tsp dried parsley; 1/2 tsp dried thyme; 1/2 tsp black pepper; 1 tbsp butter (for cooking patties); 1 1/2 cups shredded Gruyere cheese; 1/2 cup mayonnaise; 2 tbsp steak sauce (or 1 tbsp Worcestershire + 1 tbsp ketchup); 1/2 tsp cracked black pepper (for mayo); 12 slider buns, toasted; 1 cup arugula or preferred greens

Description

Gruyere Caramelized Onion Sliders are rich, flavorful mini burgers made with juicy seasoned beef, sweet caramelized onions, and melty Gruyere cheese on toasted buns. Perfect for parties or cozy dinners, they feel gourmet yet are easy to make.

Ingredients

2 large yellow onions, thinly sliced
2 tbsp butter (for caramelizing onions)
2–3 fresh thyme sprigs
1 lb ground beef (80/20)
1 beef bouillon cube, crushed (or 1 tsp bouillon paste)
1 tsp dried onion flakes
1/2 tsp celery seed
1 tsp dried parsley
1/2 tsp dried thyme
1/2 tsp black pepper
1 tbsp butter (for cooking patties)
1 1/2 cups shredded Gruyere cheese
1/2 cup mayonnaise
2 tbsp steak sauce (or 1 tbsp Worcestershire + 1 tbsp ketchup)
1/2 tsp cracked black pepper (for mayo)
12 slider buns, toasted
1 cup arugula or preferred greens

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Instructions

Melt 2 tbsp butter in a skillet over medium heat. Add onions and thyme sprigs. Cook on medium-low, stirring often, until deeply caramelized (30–45 minutes). Remove thyme stems and set aside.
Mix mayo, steak sauce, and cracked pepper. Refrigerate until ready to use.
In a bowl, combine ground beef, bouillon, dried onion, celery seed, parsley, thyme, and pepper. Form into 12 meatballs.
Heat 1 tbsp butter in a skillet over medium-high heat. Add meatballs, cook 2 minutes, flip, and smash into thin patties. Cook 2 more minutes.
Top each patty with Gruyere and cook until cheese is melted. Remove from heat.
Assemble sliders: layer arugula on bottom bun, add patty, top with caramelized onions, spread mayo on top bun, and close.

Notes

Caramelized onions can be made a day ahead and reheated.
Use Swiss or cheddar if Gruyere isn’t available.
To freeze raw patties, separate with parchment and store in a sealed bag.
Reheat patties and onions separately for best texture when storing leftovers.

Prep Time: 20 minutes
Cook Time: 45 minutes
Category: Main Dish
Method: Stovetop
Cuisine: American

Nutrition

Serving Size: 2 sliders
Calories: 520
Sugar: 5g
Sodium: 540mg
Fat: 35g
Saturated Fat: 16g
Unsaturated Fat: 15g
Trans Fat: 1g
Carbohydrates: 28g
Fiber: 2g
Protein: 25g
Cholesterol: 95mg