Directions:

Cook the Beef:

Preheat your oven to 350°F (175°C).

In a large skillet over medium-high heat, brown the ground beef with the minced onion, breaking the meat apart as it cooks.

Drain any excess grease, if necessary.

Add Flavorings:

Crumble the beef bouillon cube into the skillet.

Add water, brown sugar, apple cider vinegar, and Worcestershire sauce to the beef.

Bring the mixture to a boil, then reduce the heat and let it simmer until the liquid has mostly evaporated.

Assemble the Sliders:

Place the bottoms of the slider buns in a baking dish.

Spoon the beef mixture evenly onto the bun bottoms.

Add pickle slices and a half slice of American cheese to each slider.

Cap with the top halves of the buns.

Prepare the Butter Sauce:

In a small bowl, whisk together the melted butter, brown sugar, Dijon mustard, and Worcestershire sauce.

Brush this mixture generously over the top of the buns.