Strawberry Shortcake

1 cup sugar
1/2 cup butter or margarine, softened
1 egg
2 tsp vanilla, divided
1 1/2 cups flour
1/2 tsp baking powder
1 cup mini or regular chocolate chips
16 oz sour cream
2 eggs
2 cups cool whip
Strawberries, rinsed and halved

Heat oven to 350. Grease 9-inch springform pan(I just used a normal dark pan). Beat 1/2 cup sugar and butter in large bowl.  Add 1 egg and 1 tsp vanilla; beat until creamy.  Gradually add flour and baking powder, beating until smooth; stir in 1/2 cup chocolate chips. Press mixture onto bottom of pan.  Stir together sour cream, remaining 1/2 cup sugar, 2 eggs, and remaining 1 tsp vanilla in medium bowl.  Stir in remaining 1/2 cup chocolate chips. Pour over mixture in pan.  Bake 50-55 minutes until almost set in center and edges are slightly brown.  Cool completely on wire rack; spread cool whip over top.  Cover and refrigerate.  Top with sliced strawberries when serving.