In a saucepan, stir egg yolks, sugar, sour cream, and instant vanilla pudding mix powder. Bring to a boil and remove from heat; stir in cooled raisins and vanilla extract. Spread over the par-baked crust layer and then crumble the rest of the reserved uncooked oatmeal mixture on top. Bake for another 25 minutes at 350 degrees. Cool and store in a refrigerator.