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