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Preheat oven to 350 degrees F & grease a 13"x9" glass baking dish.
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In a medium saucepan, combine raisins & water, then cook over medium heat for 10 minutes before draining well. Set raisins aside to cool.
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In a medium bowl, combine brown sugar, butter, oats, flour & baking soda, mixing well.
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Evenly press 2 cups of the mixture into the bottom of the prepared baking dish, & bake for 7 minutes, until partially cooked & slightly set.
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In a medium saucepan, combine egg yolks, granulated sugar, sour cream, cornstarch & cinnamon, & stir until cornstarch is dissolved.
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Cook over medium heat until mixture thickens & resembles pudding, about 8 minutes, then remove from heat & stir in raisins & vanilla.
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Pour onto the crust , then crumble remaining oat mixture evenly over the top.
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Bake 25 minutes, or until set, then remove from oven & cool completely on a wire rack.
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Refrigerate 1 hour before cutting & serving.