Preheat oven to 325ºF. Spray 9 x 13 in. pan with vegetable pan spray.
In large bowl, cream butter and granulated sugar with electric mixer until light and fluffy. Add eggs and vanilla; beat well. Combine flour, baking powder, baking soda and salt. Add alternately with sour cream to butter mixture; mix until smooth. In small bowl, combine nuts, brown sugar and cinnamon.
Spread half the batter into prepared pan. Sprinkle 1-1/2 cups nut mixture over batter and top evenly with apricots; top with remaining batter. Sprinkle with remaining nut mixture. Bake 55-60 minutes or until cake tester inserted in middle comes out clean.