Sour Cream Apple Bars

1 cup Butter or Margarine -- softened
1 cup Brown Sugar, packed
2 cups Quick Cooking Oats -- uncooked
1 cup Flour
1 cup Chopped Walnuts
1 teaspoon Baking Soda
1 teaspoon Ground Cinnamon
1/4 teaspoon Allspice
Filling:
1 cup Sour Cream
3/4 cup Sugar
2 tablespoons Flour
1 Egg
2 cups Apples, raw -- shredded

Pre-heat oven to 350 degrees F. Combine butter and brown sugar in a large mixing bowl. Using an electric mixer, beat at medium speed until creamy. Add remaining ingredients and continue beating until well mixed. Press half of mixture in to the bottom of an ungreased 9x13 inch baking pan, and bake for 8-10 minutes or until golden brown. Meanwhile, combine all filling ingredients in a large mixing bowl and mix well. Pour filling over hot crust, then crumble remaining crust mixture over filling and press down lightly. Bake for 25-30 minutes or until top is golden brown and center is set. Cool completely and cut into bars. Store in refrigerator.