Brioche slider buns cradle savory seasoned ground beef, molten layers of cheddar, and a zingy sriracha-laced aioli—all baked to golden, butter-brushed perfection for an irresistibly cheesy bite.
Preheat the oven to 375 °F and lightly coat a 9 × 13 inch baking dish with non-stick spray; warm a 12-inch skillet over medium heat.
Cook ground beef with onion, salt, pepper, and garlic powder, stirring often, until the meat browns, about 10 minutes; drain excess grease if necessary.
Whisk mayonnaise, sriracha, lime juice, garlic, and salt in a small bowl to make the aioli; set aside.
Off the heat, blend ½ cup mayonnaise and the shredded cheddar into the browned beef until evenly combined.
Line the prepared dish with the bottom halves of the slider buns, layer five cheddar slices over them, spoon on the beef mixture, drizzle with sriracha aioli, top with the remaining cheddar slices, and cap with the bun tops.
Brush the buns with melted butter, scatter sesame seeds over the surface, and bake, uncovered, for 15–20 minutes until the cheese is fully melted and the tops are lightly browned.
Allow the sliders to rest briefly before slicing and serving hot.