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Preheat oven to 350 degrees F. Grease 13 x 9-inch baking pan.
For topping: Combine brown sugar, flour and butter in small bowl with pastry blender or two knives until mixture is crumbly. Stir in nuts and 1/2 cup morsels.
For cake: Combine flour, baking powder, baking soda and salt in small bowl.
Beat granulated sugar, butter and vanilla extract in large mixer bowl until creamy. Add eggs one at a time, beating well after each addition. Gradually add flour mixture alternately with sour cream. Fold in remaining morsels. Spread into prepared baking pan; sprinkle with topping. Bake 25 to 35 minutes or until wooden pick inserted in center comes out clean. Cool in pan on wire rack.
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