"These quick and easy cheeseburger sliders are baked together on Hawaiian rolls and served straight out of the baking dish, casserole-style...."
INGREDIENTS
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1 pound ground beef
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1/2 onion, chopped
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2 tablespoons ketchup
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3 teaspoons Dijon mustard, divided
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3 teaspoons Worcestershire sauce, divided
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1/2 teaspoon garlic powder
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salt and ground black pepper to taste
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1 (12 count) package Hawaiian bread rolls
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1 (8 ounce) package shredded Monterey Jack cheese
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1/4 cup butter
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1 tablespoon brown sugar