Step 1

Preheat oven to 350˚ F and butter a 9×13 inch pan.

Step 2

In a mixing bowl, cream together shortening and sugar.  Add 2 well beaten eggs and vanilla.

Step 3

In a seaparate bowl, mix together flour, baking powder and salt.  Add to the creamed mixture along with the sour cream.

Step 4

Fold in the chopped apples and walnuts.  Spread in a greased 9×13 pan.

Step 5

In a small bowl, cut in butter to the cinnamon and brown sugar.  Sprinkle over the batter in the 9×13 inch pan.  Bake at 350˚F for 35-40 or until a toothpick inserted in the middle comes out clean.