2 sticks butter, softened
1 1/2 cups sugar
2 eggs
2 cups flour
1 tsp. baking powder
1/2 tsp. baking soda
1/2 tsp. salt
1 cup sour cream
1 tsp. vanilla

Topping:

1/2 cup chopped nuts
1/2 cup brown sugar
1/4 cup sugar
1 tsp. cinnamon

Preheat oven to 350°F. Grease and flour 9x13-inch or 10-inch round cake pan.

Beat together butter and sugar. Add eggs, one at a time, beating after each addition. Beat until light and fluffy.

In a mixing bowl, whisk together flour, baking powder, baking soda and salt. Add flour mixture to egg mixture alternately with sour cream (1/3 flour mixture, 1/2 sour cream, 1/3 flour mixture, remaining sour cream, remaining flour mixture). Stir in the vanilla.

In a separate bowl, combine ingredients for the topping.

Pour half of batter into the pan and sprinkle with half of topping. Repeat.

Bake for 50 minutes or until a toothpick inserted in center comes out clean (cake will shrink slightly from sides of pan).