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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
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