=== FILLING AND TOPPING ===
1 1/2 cups finely-chopped walnuts
6 tablespoons sugar
1 tablespoon ground cinnamon
=== CAKE ===
2 sticks unsalted butter softened
1 1/4 cups sugar
2 1/2 cups cake flour
1 teaspoon baking powder
1 teaspoon baking soda
1/4 teaspoon salt
3 large eggs
1 teaspoon pure vanilla extract
1 cup sour cream
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