Smashburger-Inspired Beef Sliders with Caramelized Onions

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Juicy mini beef patties smashed on a hot griddle, topped with sweet caramelized onions and melted cheese. This american-inspired beef ready in about 30 minutes pairs ground beef (80/20), large, thinly sliced yellow onion, salt for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 15 min Serves 4 American cuisine 420 cal/serving
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Ingredients

Instructions

  1. Step 1: Heat 2 tbsp butter in a skillet over medium heat. Add 1 large thinly sliced yellow onion and cook, stirring occasionally, for about 15 minutes until the onions are deep golden brown and caramelized. Remove and set aside.
  2. Step 2: Divide 1 lb ground beef into 8 equal portions and form loose balls. Heat 1 tbsp vegetable oil on a cast iron skillet or heavy pan over medium-high heat until shimmering.
  3. Step 3: Place 2-3 meat balls on the skillet and immediately press down firmly with a spatula to smash into 3-inch thin patties. Cook for 2-3 minutes until edges are browned and crispy.
  4. Step 4: Flip the patties and place half a cheddar slice (4 slices halved) on each patty. Cook for another 1-2 minutes until cheese melts and patties are cooked through.
  5. Step 5: Toast 8 mini slider buns for 1-2 minutes on the skillet until golden.
  6. Step 6: Assemble sliders by layering caramelized onions over each cheese-topped patty, then sandwich with the toasted buns.

Equipment for this recipe

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Frequently asked questions

How long does Smashburger-Inspired Beef Sliders with Caramelized Onions take to make?

Total time is about 30 minutes (15 min prep + 15 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Smashburger-Inspired Beef Sliders with Caramelized Onions?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep ground beef (80/20) from drying out.

Can I substitute ingredients in Smashburger-Inspired Beef Sliders with Caramelized Onions?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Smashburger-Inspired Beef Sliders with Caramelized Onions for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Smashburger-Inspired Beef Sliders with Caramelized Onions?

American beef like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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