Ingredients:
- 12 tbsp. unsalted butter, cubed, plus more for pan
- 3 cups flour, plus more for pan
- 4½ tsp. freshly grated nutmeg
- 2 tsp. baking powder
- 1 tsp. ground cinnamon
- ¾ tsp. baking soda
- ½ tsp. kosher salt
- 2 cups packed light brown sugar
- 1½ cups sour cream
- 1 cup milk
- 2 eggs, beaten
- ½ cup finely chopped walnuts
- Confectioners' sugar, for dusting