INGREDIENTS
1 cup
unsalted butter room temperature, plus more for pan
3 cups
all-purpose flour (spooned and leveled) plus more for pan
1 tbsp
baking powder
1 tsp
salt
1 cup
sour cream
1/2 tsp
baking soda
1 1/2 cups
sugar
3
large eggs room temperature
2 tsp
vanilla extract
Cinnamon-Walnut Topping (In a small bowl stir together ¾ cup chopped walnuts, ¾ cup sugar, and 2 teaspoons ground cinnamon.)