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In a shallow bowl, mix together the first 5 ingredients.
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Place the onions in a second bowl.
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Roll the tenderloin in the butter mixture, coating all sides, then coat with crushed onions.
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Place in a foil-lined baking pan and top with any remaining onions.
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Drizzle with any remaining butter mixture.
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Bake, covered, in a preheated 350-degree oven for approx 35 - 40 minutes.
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Uncover and bake approximately 10 more minutes, untill the onions are lightly browned and crispy.