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Place potatoes in a saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or just until tender. Drain; cool slightly.
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Cut potatoes into 1/4-in.-thick slices. Place in a single layer in three greased 15-in. x 10-in. x 1-in. baking pans. Top each with salad dressing mix, a jalapeno slice, cheddar cheese and Monterey Jack cheese.
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Bake, uncovered, at 350° for 10-12 minutes or until cheese is melted. Top with sour cream and green onions.