Ingredients
Streusel:
1/4 cup sugar
3 packed tablespoons dark brown sugar
1/2 cup walnuts, toasted and coarsely chopped
2 teaspoon vanilla extract
1/2 teaspoon ground cinnamon
Cake:
2 cups unbleached all-purpose flour
1 teaspoon baking soda
1/2 teaspoon fine salt
Generous pinch freshly grated nutmeg
Generous pinch ground mace
3/4 cup unsalted butter, plus more for the pan, room temperature
1 cup sugar
2 large eggs, room temperature
1 cup sour cream
1 1/2 teaspoons vanilla extract
Directions
- Make the streusel by mixing the sugar, brown sugar, walnuts, vanilla, and cinnamon together in a small bowl. Set it aside.
- Preheat the oven to 350 degrees F. Generously brush a round 9 by 2-inch deep cake pan with butter. In a medium bowl whisk the flour, baking soda, salt, nutmeg and mace together and set it aside.
- In a standing mixer fitted with the paddle attachment, or with an electric hand-held mixer, cream the butter and sugar on medium speed until light and fluffy. Add the eggs, one at a time, mixing until incorporated. Mix the vanilla with the sour cream. Add the flour mixture in 3 parts to the butter mixture, alternating with the sour cream in 2 parts until just combined.