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Move rack to the middle position in oven and pre-heat oven to 425 degrees.
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Whisk milk, vanilla, eggs and salt in a medium bowl; vigorously whisk in flour until mostly smooth with a few small lumps.
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Let stand for a few minutes and whisk again (use a blender for instantly smooth batter).
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Bring marmalade, cranberries and 1/4 cup water to a simmer over medium heat; continue to simmer to light syrup consistency, just a few minutes; cover and keep warm.
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Meanwhile hear butter in a heavy bottom skillet (a cast iron pan works well) over medium heat until light golden brown.
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Pour milk mixture into skillet.
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Transfer to oven and bake until puffed and golden (15-17 minutes).
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Without removing Dutch Baby from oven, sprinkle with sugar and turn oven to broil until very puffy and golden brown, a couple of minutes longer.
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Serve immediately from the skillet and drizzle with sauce.