Preheat the air fryer: Set it to 375°F (190°C) for 3–5 minutes. A hot basket helps the sliders brown nicely.
Season the beef: In a bowl, mix ground beef with 1–1.5 teaspoons salt, 1/2 teaspoon black pepper, 1/2 teaspoon garlic powder, and 1–2 teaspoons Worcestershire sauce if using. Don’t overwork the meat; mix just until combined.
Shape the patties: Form 8–10 small balls, about 2 ounces each.
Flatten into thin patties slightly larger than your buns—they shrink as they cook. Press a small dimple in the center of each to prevent doming.
Prep the buns (optional): Split the slider buns. Brush the cut sides with melted butter.
If you like, sprinkle a few sesame seeds on top buns if they’re plain.
Toast the buns: Air fry the buns cut-side up for 1–2 minutes until lightly golden. Remove and set aside.
Cook the patties: Arrange patties in a single layer in the air fryer basket. Don’t overcrowd; cook in batches if needed.
Air fry for 4 minutes, then check. For medium doneness, cook 5–6 minutes total; for well-done, 6–7 minutes. Thickness and model may vary, so keep an eye on them.
Add cheese: In the last 30–60 seconds, place cheese on each patty so it melts gently.
If your air fryer blasts air, close it quickly so the cheese doesn’t blow off, or tuck a corner under the patty edge.
Assemble: Spread ketchup, mustard, and/or mayo on the toasted buns. Add patties, onions, and pickles. Top and serve right away while hot and juicy.
Batch and serve: Keep finished sliders warm on a low oven setting (200°F / 95°C) while you finish the next batch.