2 sticks butter (1 cup), room temperature
2 cups sugar
1 teaspoon vanilla
1 cup sour cream
1/2 teaspoon baking powder
3 cups all-purpose flour
6 eggs
Cream butter, sugar, and vanilla together; add eggs, one at a time, beating after each. Sift baking powder and flour together, add alternately with sour cream, starting and ending with flour, and beating at low speed just until combined. Spread batter in a 10″ tube pan that is coated with butter and then dusted with flour. Bake at 300° F about 80 minutes, or until cake tests done. Cool 10 minutes; turn out of pan and cool on rack.