Combine oats, brown sugar, butter, flour and baking soda until crumbly. Save 2 cups for topping. Press remaining mixture into 13x9 baking pan.Bake at 350 for 10 minutes.
Meanwhile combine beaten egg yolks, sour cream, cornstarch, sugar and raisins mix well.Blend in spices. Place mixture in 2 quart saucepan. Bring to boil stirring constantly for 5 to 10 minutes until thickened.
Pour over parially baked crust. Top with reserved crumb mixture. Bake for 20 minutes.