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Preheat oven to 375F.
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Toast and cube the english muffins.
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Butter a casserole dish, and spread the muffin cubes into the bottom of the dish. Set aside.
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Melt butter in a large, non-stick skillet. Sauté the ham and chopped green onions until the ham starts to brown, stirring occasionally.
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Put the ham and green onions in an even layer over the cubed english muffins.
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Top the ham with shredded cheese in an even layer.
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Mix together the eggs, milk, sour cream, mustard, and salt. Pour egg mixture over the other ingredients in the casserole dish.
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Cover the dish with foil.
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Bake the casserole for 30 minutes, covered.
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Remove the foil, and continue baking for another 15 minutes.
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While the casserole is in the oven, make the hollandaise sauce according to package directions (or use your favorite recipe).
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When the casserole is out of the oven, top with hollandaise sauce. Serve warm and enjoy!
