材料:材料:
butter (奶油) 1 stick (8 tablespoons)
sugar (糖) 1 cup
large egg (大蛋) 3
sour cream (酸奶油) 1 cup (8 oz)
vanilla extract (香草精) 1 teaspoon
cake flour (低筋面粉) 2 cups
baking powder (泡打粉) 1 1/2 teaspoons
baking soda (苏打粉) 1/2 teaspoon
salt (盐) 1/2 teaspoon
For the streusel:
light brown sugar (黄糖) 1/4 cup
all-purpose flour (中筋面粉) 1/2 cup
ground cinnamon (肉桂粉) 1 1/2 teaspoons
salt (盐) 1/4 teaspoons
butter 3 tablespoons, 切成小块
chopped walnut (核桃碎) 3/4 cup