1. Preheat oven to 350°. Beat butter and sugar together in a large bowl; beat in eggs. Stir in buttermilk and next 3 ingredients.
2. Combine flour and next 3 ingredients in a medium bowl. Add flour mixture to butter mixture, stirring until well blended. Pour batter into 2 greased and floured 8-inch round cake pans.
3. Bake 30 minutes or until a wooden pick inserted in center comes out clean. Remove from pans, and cool completely on a wire rack. Cut each cake layer in half horizontally to make 4 layers.
4. Beat whipping cream and powdered sugar until soft peaks form. Spread one-fourth whipped cream mixture over 1 cake layer; top evenly with one-fourth berries. Repeat with remaining cake layers, whipping cream mixture, and berries.