Season the steak with salt and pepper. Heat olive oil in a skillet over medium-high heat and sear the steak for about 4-5 minutes on each side for medium-rare doneness. Let it rest for five minutes before slicing thinly.

In the same skillet, lower the heat and add sliced onions. Cook until soft and golden brown, about 10-15 minutes.

Toast slider buns lightly until golden brown.

On each bun bottom, layer a slice of steak, caramelized onions, cheese, and drizzle with barbecue sauce.

Melt cheese under the broiler for about one minute until gooey.

Serve warm with your favorite sides.