In a microwave safe bowl or measuring cup melt 1/2 cup of butter. Once melted, whisk in 2 tablespoons Worcestershire, 1 tablespoon Old Bay, 2 teaspoons garlic powder, 1 teaspoon dried parsley, 1 teaspoon smoke paprika, 1/2 teaspoon ground pepper and 1/2 teaspoon salt together in a medium bowl.
Place 2 packages frozen onions in a large 9 by 13 casserole dish. Pour the butter sauce over the onions and toss to coats. Cover tightly with foil. Bake for 1 hour.
Increase the oven temp to 425 degrees and remove the foil from the dish. Bake for another 20 minutes.
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