Moist Sour Cream Coffee Cake Recipe

 With electric mixer on medium speed, mix granulated sugar, butter and vanilla in large bowl  until light and fluffy. Add eggs, 1 at a time, mixing well after each addition. Mix together flour, baking powder and baking soda. Add to sugar mixture alternately with sour cream, mixing until well blended after each addition.
Mix pecans, brown sugar and cinnamon. Spoon half of the pecan mixture into prepared pan top with half of the cake batter. Repeat layers.
Bake until toothpick inserted in center comes out clean. Cool 10 minutes on wire rack. Loosen cake from side of pan with spatula or knife. Invert cake onto wire rack; gently remove pan. Cool completely.