FRENCH ONION BEEF SLIDERS FOR A CROWD


INGREDIENTS :
8 tablespoons (1 stick) butter, divided
2 large sweet onions, sliced
2 pounds ground beef
2 tablespoons beef base (such as Better than Boullion), divided
1 tablespoon Worcestershire sauce, divided
Kosher salt and black pepper, to taste
24 slider buns
12-16 ounces gruyere cheese, chopped
2 tablespoons sesame seeds
1 tablespoon fresh thyme
1 teaspoon onion powder
1 teaspoon garlic powder

DIRECTIONS :
1 : Melt 2 tablespoons of the butter in a skillet over medium heat. Add in the onions and reduce the heat to medium low. Cook, stirring occasionally, until lightly caramelized, about 25-30 minutes. If the onions start to look dry or burnt, add a tablespoon of water to the pan.

2 : In a large bowl, mix the ground beef with half of the beef base and half of the Worcestershire sauce. Season generously with salt and pepper.

3 : Add the beef to the skillet full of onions. Increase heat to medium-high and brown the beef, breaking it up and mixing with the onions as you go. Once browned, drain off excess grease.

4 : Preheat the oven to 350°F. Lightly grease a large baking sheet. Separate the tops from the bottoms of the slider buns. Fit the slider bottom buns tightly on the baking sheet.

5 : Evenly distribute the beef and onion mixture over the bottom buns. Top with the gruyere cheese. Cover with the top buns.

6 : In a microwave safe bowl, melt the butter with the remaining beef base. Stir in the remaining Worcestershire sauce and continue to mix until well-combined. Using a pastry brush, brush the beefy butter mixture over the top buns. Sprinkle with the sesame seeds, thyme, onion powder, and garlic powder.

7 : Bake the sliders until the cheese is fully melted and the tops of the rolls are lightly browned, about 20 minutes.
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